Add vc-create/switch/print-branch to menu and update documentation (bug#63690)

* doc/emacs/maintaining.texi (VC Change Log):
Add 'C-x v b l' (vc-print-branch-log).
(Creating Branches): Add @kindex and @findex for vc-create-branch.
(Switching Branches): Add @kindex and @findex for vc-switch-branch.

* lisp/vc/vc-hooks.el (vc-menu-map): Add menu items for new
commands vc-create-branch and vc-switch-branch, and also
vc-print-branch-log.

* lisp/vc/vc.el (vc-print-branch-log): Improve docstring.

doc/emacs/maintaining.texi

@@ -999,6 +999,10 @@ Display the change history for the current fileset
 Display the change history for the current repository
 (@code{vc-print-root-log}).
 
+@item C-x v b l
+Display the change history for another branch
+(@code{vc-print-branch-log}).
+
 @item C-x v I
 Display the changes that a ``pull'' operation will retrieve
 (@code{vc-log-incoming}).
@@ -1063,6 +1067,13 @@ showing only the first line of each log entry.  However, you can type
 @file{*vc-change-log*} buffer to reveal the entire log entry for the
 revision at point.  A second @key{RET} hides it again.
 
+@kindex C-x v b l
+@findex vc-print-branch-log
+  @kbd{C-x v b l @var{branch-name} @key{RET}} (@code{vc-print-branch-log})
+displays a @file{*vc-change-log*} buffer showing the history of the
+version-controlled directory tree like @code{vc-print-root-log} does,
+but in another branch provided as an argument.
+
 @kindex C-x v I
 @kindex C-x v O
 @findex vc-log-incoming
@@ -1523,6 +1534,8 @@ switch to another branch using the @kbd{svn switch} command.  With
 Mercurial, command @kbd{hg update} is used to switch to another
 branch.
 
+@kindex C-x v b s
+@findex vc-switch-branch
   The VC command to switch to another branch in the current directory
 is @kbd{C-x v b s @var{branch-name} @key{RET}} (@code{vc-switch-branch}).
 
@@ -1673,9 +1686,12 @@ branch ID for a branch starting at the current revision.  For example,
 if the current revision is 2.5, the branch ID should be 2.5.1, 2.5.2,
 and so on, depending on the number of existing branches at that point.
 
+@kindex C-x v b c
+@findex vc-create-branch
   This procedure will not work for distributed version control systems
 like git or Mercurial.  For those systems you should use the command
-@code{vc-create-branch} (@kbd{C-x v b c}) instead.
+@code{vc-create-branch} (@kbd{C-x v b c @var{branch-name} @key{RET}})
+instead.
 
   To create a new branch at an older revision (one that is no longer
 the head of a branch), first select that revision (@pxref{Switching

lisp/vc/vc-hooks.el

@@ -897,6 +897,15 @@ In the latter case, VC mode is deactivated for this buffer."
     (bindings--define-key map [vc-create-tag]
       '(menu-item "Create Tag" vc-create-tag
 		  :help "Create version tag"))
+    (bindings--define-key map [vc-print-branch-log]
+      '(menu-item "Show Branch History..." vc-print-branch-log
+		  :help "List the change log for a branch"))
+    (bindings--define-key map [vc-switch-branch]
+      '(menu-item "Switch Branch..." vc-switch-branch
+		  :help "Switch to another branch"))
+    (bindings--define-key map [vc-create-branch]
+      '(menu-item "Create Branch..." vc-create-branch
+		  :help "Make a new branch"))
     (bindings--define-key map [separator1] menu-bar-separator)
     (bindings--define-key map [vc-annotate]
       '(menu-item "Annotate" vc-annotate

lisp/vc/vc.el

@@ -2851,7 +2851,8 @@ with its diffs (if the underlying VCS backend supports that)."
 
 ;;;###autoload
 (defun vc-print-branch-log (branch)
-  "Show the change log for BRANCH root in a window."
+  "Show the change log for BRANCH in a window.
+The command prompts for the branch to log."
   (interactive
    (let* ((backend (vc-responsible-backend default-directory))
           (rootdir (vc-call-backend backend 'root default-directory)))