; Fix recent changes in treesit documentation

* lisp/treesit.el (treesit-defun-name-function, treesit-node-at)
(treesit-node-on): Doc fixes.

* doc/lispref/parsing.texi (Tree-sitter major modes): Fix wording,
punctuation, and indexing.
(Retrieving Nodes): Fix wording and add cross-references.

doc/lispref/parsing.texi

@@ -580,8 +580,8 @@ If @var{parser-or-lang} is a parser object, this function uses that
 parser; if @var{parser-or-lang} is a language, this function uses the
 first parser for that language in the current buffer, or creates one
 if none exists; if @var{parser-or-lang} is @code{nil}, this function
-tries to guess the language at @var{pos} by
-@code{treesit-language-at}.
+tries to guess the language at @var{pos} by calling
+@code{treesit-language-at} (@pxref{Multiple Languages}).
 
 If this function cannot find a suitable node to return, it returns
 @code{nil}.
@@ -616,7 +616,7 @@ If @var{parser-or-lang} is a parser object, this function uses that
 parser; if @var{parser-or-lang} is a language, this function uses the
 first parser for that language in the current buffer, or creates one
 if none exists; if @var{parser-or-lang} is @code{nil}, this function
-tries to guess the language at @var{beg} by
+tries to guess the language at @var{beg} by calling
 @code{treesit-language-at}.
 
 If @var{named} is non-@code{nil}, this function looks for a named node
@@ -1717,16 +1717,22 @@ This function activates some tree-sitter features for a major mode.
 
 Currently, it sets up the following features:
 @itemize
+@cindex treesit-font-lock-settings
 @item
 If @code{treesit-font-lock-settings} is non-@code{nil}, it sets up
 fontification.
+
+@cindex treesit-simple-indent-rules
 @item
 If @code{treesit-simple-indent-rules} is non-@code{nil}, it sets up
 indentation.
+
+@cindex treesit-defun-type-regexp
 @item
 If @code{treesit-defun-type-regexp} is non-@code{nil}, it sets up
 navigation functions for @code{beginning-of-defun} and
 @code{end-of-defun}.
+
 @item
 If @code{treesit-defun-name-function} is non-@code{nil}, it sets up
 add-log functions used by @code{add-log-current-defun}.
@@ -1747,9 +1753,9 @@ provides some additional functions for working with defuns:
 
 @defun treesit-defun-at-point
 This function returns the defun node at point, or @code{nil} if none
-is found.  It respects @code{treesit-defun-tactic}: it returns the
-top-level defun if the value is @code{top-level}, and returns the
-immediate enclosing defun if the value is @code{nested}.
+is found.  It respects @code{treesit-defun-tactic}: if its value is
+@code{top-level}, this function returns the top-level defun, and if
+its value is @code{nested}, it returns the immediate enclosing defun.
 
 This function requires @code{treesit-defun-type-regexp} to work.  If
 it is @code{nil}, this function simply returns @code{nil}.
@@ -1760,19 +1766,20 @@ This function returns the defun name of @var{node}.  It returns
 @code{nil} if there is no defun name for @var{node}, or if @var{node}
 is not a defun node, or if @var{node} is @code{nil}.
 
-The defun name is names like function name, class name, struct name,
-etc.
+Depending on the language and major mode, the defun names are names
+like function name, class name, struct name, etc.
 
 If @code{treesit-defun-name-function} is @code{nil}, this function
 always returns @code{nil}.
 @end defun
 
 @defvar treesit-defun-name-function
-If non-@code{nil}, this variable should store a function that is
-called with a node and returns the defun name of it.  The function
-should have the same semantic as @code{treesit-defun-name}: if the
-node is not a defun node, or the node is a defun node but doesn't have
-a name, or the node is @code{nil}, return @code{nil}.
+If non-@code{nil}, this variable's value should be a function that is
+called with a node as its argument, and returns the defun name of the
+node.  The function should have the same semantic as
+@code{treesit-defun-name}: if the node is not a defun node, or the
+node is a defun node but doesn't have a name, or the node is
+@code{nil}, it should return @code{nil}.
 @end defvar
 
 @node Tree-sitter C API

lisp/treesit.el

@@ -174,8 +174,7 @@ only look for named nodes.
 If PARSER-OR-LANG is a parser, use that parser; if PARSER-OR-LANG
 is a language, find the first parser for that language in the
 current buffer, or create one if none exists; If PARSER-OR-LANG
-is nil, try to guess the language at POS by
-`treesit-language-at'."
+is nil, try to guess the language at POS using `treesit-language-at'."
   (let* ((root (if (treesit-parser-p parser-or-lang)
                    (treesit-parser-root-node parser-or-lang)
                  (treesit-buffer-root-node
@@ -224,8 +223,7 @@ named node.
 If PARSER-OR-LANG is a parser, use that parser; if PARSER-OR-LANG
 is a language, find the first parser for that language in the
 current buffer, or create one if none exists; If PARSER-OR-LANG
-is nil, try to guess the language at BEG by
-`treesit-language-at'."
+is nil, try to guess the language at BEG using `treesit-language-at'."
   (let ((root (if (treesit-parser-p parser-or-lang)
                   (treesit-parser-root-node parser-or-lang)
                 (treesit-buffer-root-node
@@ -1613,8 +1611,8 @@ newline after a defun, or the beginning of a defun.
 If the value is nil, no skipping is performed.")
 
 (defvar-local treesit-defun-name-function nil
-  "A function called with a node and returns the name of it.
-If the node is a defun node, return the defun name.  E.g., the
+  "A function that is called with a node and returns its defun name or nil.
+If the node is a defun node, return the defun name, e.g., the
 function name of a function.  If the node is not a defun node, or
 the defun node doesn't have a name, or the node is nil, return
 nil.")