Use @key{} where it is missing in the manuals

doc/emacs/display.texi

@@ -1259,9 +1259,9 @@ Highlight empty lines.
 @item big-indent
 @vindex whitespace-big-indent-regexp
 Highlight too-deep indentation.  By default any sequence of at least 4
-consecutive TAB characters or 32 consecutive SPC characters is
+consecutive @key{TAB} characters or 32 consecutive @key{SPC}
-highlighted.  To change that, customize the regular expression
+characters is highlighted.  To change that, customize the regular
-@code{whitespace-big-indent-regexp}.
+expression @code{whitespace-big-indent-regexp}.
 
 @item space-mark
 Draw space and non-breaking characters with a special glyph.

doc/emacs/emacs.texi

@@ -723,7 +723,7 @@ C and Related Modes
 
 * Motion in C::         Commands to move by C statements, etc.
 * Electric C::          Colon and other chars can automatically reindent.
-* Hungry Delete::       A more powerful DEL command.
+* Hungry Delete::       A more powerful @key{DEL} command.
 * Other C Commands::    Filling comments, viewing expansion of macros,
                           and other neat features.
 

doc/emacs/killing.texi

@@ -857,7 +857,7 @@ region is active.
 
 Unlike the standard region, the region-rectangle can have its corners
 extended past the end of buffer, or inside stretches of white space
-that point normally cannot enter, like the TAB.
+that point normally cannot enter, like the @key{TAB}.
 
 @findex rectangle-exchange-point-and-mark
 @findex exchange-point-and-mark@r{, in rectangle-mark-mode}

doc/emacs/maintaining.texi

@@ -1899,7 +1899,7 @@ Move to the previous reference and display it in the other window
 @findex xref-show-location-at-point
 Display the reference on the current line in the other window
 (@code{xref-show-location-at-point}).
-@item TAB
+@item @key{TAB}
 @findex xref-quit-and-goto-xref
 Display the reference on the current line and bury the @file{*xref*}
 buffer (@code{xref-quit-and-goto-xref}).

doc/emacs/programs.texi

@@ -1587,7 +1587,7 @@ with Emacs.
 @menu
 * Motion in C::                 Commands to move by C statements, etc.
 * Electric C::                  Colon and other chars can automatically reindent.
-* Hungry Delete::               A more powerful DEL command.
+* Hungry Delete::               A more powerful @key{DEL} command.
 * Other C Commands::            Filling comments, viewing expansion of macros,
                                 and other neat features.
 @end menu

doc/emacs/search.texi

@@ -1675,8 +1675,8 @@ line.  In particular, @kbd{C-g} simply exits the @code{query-replace}.
 
   To restart a @code{query-replace} once it is exited, use @kbd{C-x
 @key{ESC} @key{ESC}}, which repeats the @code{query-replace} because it
-used the minibuffer to read its arguments.  @xref{Repetition, C-x ESC
+used the minibuffer to read its arguments.  @xref{Repetition, C-x @key{ESC}
-ESC}.
+@key{ESC}}.
 
 @cindex invisible text, and query-replace
   The option @code{search-invisible} determines how @code{query-replace}

doc/lispref/commands.texi

@@ -748,7 +748,7 @@ part of the prompt.
 @group
 (execute-extended-command 3)
 ---------- Buffer: Minibuffer ----------
-3 M-x forward-word RET
+3 M-x forward-word @key{RET}
 ---------- Buffer: Minibuffer ----------
      @result{} t
 @end group

doc/lispref/debugging.texi

@@ -941,10 +941,10 @@ The profiler report buffer shows, on each line, a function that was
 called, followed by how much resource (processor or memory) it used in
 absolute and percentage times since profiling started.  If a given
 line has a @samp{+} symbol at the left-hand side, you can expand that
-line by typing @key{RET}, in order to see the function(s) called by
+line by typing @kbd{@key{RET}}, in order to see the function(s) called
-the higher-level function.  Use a prefix argument (@key{C-u RET}) to
+by the higher-level function.  Use a prefix argument (@kbd{C-u
-see the whole call tree below a function.  Pressing @key{RET} again
+@key{RET}}) to see the whole call tree below a function.  Pressing
-will collapse back to the original state.
+@kbd{@key{RET}} again will collapse back to the original state.
 
 Press @kbd{j} or @kbd{mouse-2} to jump to the definition of a function.
 Press @kbd{d} to view a function's documentation.

doc/lispref/display.texi

@@ -4599,7 +4599,7 @@ first character in the group of consecutive characters that have the
 same @code{display} property.  The space width is the pixel width of
 that character, multiplied by @var{factor}.  (On text-mode terminals,
 the ``pixel width'' of a character is usually 1, but it could be more
-for TABs and double-width CJK characters.)
+for @key{TAB}s and double-width CJK characters.)
 
 @item :align-to @var{hpos}
 Specifies that the space should be wide enough to reach @var{hpos}.

doc/lispref/modes.texi

@@ -3545,10 +3545,11 @@ provided grammar is precise enough, @code{transpose-sexps} can correctly
 transpose the two arguments of a @code{+} operator, taking into account
 the precedence rules of the language.
 
-Calling @code{smie-setup} is also sufficient to make TAB indentation work in
+Calling @code{smie-setup} is also sufficient to make @key{TAB}
-the expected way, extends @code{blink-matching-paren} to apply to
+indentation work in the expected way, extends
-elements like @code{begin...end}, and provides some commands that you
+@code{blink-matching-paren} to apply to elements like
-can bind in the major mode keymap.
+@code{begin...end}, and provides some commands that you can bind in
+the major mode keymap.
 
 @deffn Command smie-close-block
 This command closes the most recently opened (and not yet closed) block.

doc/lispref/nonascii.texi

@@ -1776,7 +1776,7 @@ affect it.
 Binding @code{coding-system-for-write} to a non-@code{nil} value
 prevents output primitives from calling the function specified by
 @code{select-safe-coding-system-function} (@pxref{User-Chosen Coding
-Systems}).  This is because @kbd{C-x RET c}
+Systems}).  This is because @kbd{C-x @key{RET} c}
 (@code{universal-coding-system-argument}) works by binding
 @code{coding-system-for-write}, and Emacs should obey user selection.
 If a Lisp program binds @code{coding-system-for-write} to a value that

doc/lispref/tips.texi

@@ -17,14 +17,15 @@ should follow.
 @findex checkdoc
 @findex checkdoc-current-buffer
 @findex checkdoc-file
-  You can automatically check some of the conventions described below by
+  You can automatically check some of the conventions described below
-running the command @kbd{M-x checkdoc RET} when visiting a Lisp file.
+by running the command @kbd{M-x checkdoc @key{RET}} when visiting a
-It cannot check all of the conventions, and not all the warnings it
+Lisp file.  It cannot check all of the conventions, and not all the
-gives necessarily correspond to problems, but it is worth examining them
+warnings it gives necessarily correspond to problems, but it is worth
-all.  Alternatively, use the command @kbd{M-x checkdoc-current-buffer RET}
+examining them all.  Alternatively, use the command @kbd{M-x
-to check the conventions in the current buffer, or @code{checkdoc-file}
+checkdoc-current-buffer @key{RET}} to check the conventions in the
-when you want to check a file in batch mode, e.g., with a command run by
+current buffer, or @code{checkdoc-file} when you want to check a file
-@kbd{@w{M-x compile RET}}.
+in batch mode, e.g., with a command run by @kbd{@w{M-x compile
+@key{RET}}}.
 
 @menu
 * Coding Conventions::        Conventions for clean and robust programs.
@@ -1028,7 +1029,7 @@ but only the main one.
 @findex checkdoc-package-keywords
 This line lists keywords for the @code{finder-by-keyword} help command.
 Please use that command to see a list of the meaningful keywords.  The
-command @kbd{M-x checkdoc-package-keywords RET} will find and display
+command @kbd{M-x checkdoc-package-keywords @key{RET}} will find and display
 any keywords that are not in @code{finder-known-keywords}.  If you set
 the variable @code{checkdoc-package-keywords-flag} non-@code{nil},
 checkdoc commands will include the keyword verification in its checks.