Update docs for `customize-mode'

* lisp/cus-edit.el (customize-mode): This function works with both major
and minor modes, make docstring and prompt reflect that (Bug #23649).

* doc/lispref/modes.texi (Derived Modes): Remove note about
customize-mode being experimental; it has been around since Emacs
22 (Bug #11299).

Co-authored-by: Drew Adams <drew.adams@oracle.com>

2 files changed, 9 insertions, 9 deletions

diff --git a/doc/lispref/modes.texi b/doc/lispref/modes.texi
index 4c96e63bd7b..32baa27147b 100644
--- a/doc/lispref/modes.texi
+++ b/doc/lispref/modes.texi
@@ -794,10 +794,9 @@ if @var{parent} is @code{nil}.  (Again, a @code{nil} value is
 
 @item :group
 If this is specified, the value should be the customization group for
-this mode.  (Not all major modes have one.)  Only the (still
-experimental and unadvertised) command @code{customize-mode} currently
-uses this.  @code{define-derived-mode} does @emph{not} automatically
-define the specified customization group.
+this mode.  (Not all major modes have one.)  The command
+@code{customize-mode} uses this.  @code{define-derived-mode} does
+@emph{not} automatically define the specified customization group.
 @end table
 
 Here is a hypothetical example:
diff --git a/lisp/cus-edit.el b/lisp/cus-edit.el
index d7db3530099..7826506cc46 100644
--- a/lisp/cus-edit.el
+++ b/lisp/cus-edit.el
@@ -1072,9 +1072,10 @@ are shown; the contents of those subgroups are initially hidden."
 
 ;;;###autoload
 (defun customize-mode (mode)
-  "Customize options related to the current major mode.
-If a prefix \\[universal-argument] was given (or if the current major mode has no known group),
-then prompt for the MODE to customize."
+  "Customize options related to a major or minor mode.
+By default the current major mode is used.  With a prefix
+argument or if the current major mode has no known group, prompt
+for the MODE to customize."
   (interactive
    (list
     (let ((completion-regexp-list '("-mode\\'"))
@@ -1083,8 +1084,8 @@ then prompt for the MODE to customize."
           major-mode
         (intern
          (completing-read (if group
-                              (format "Major mode (default %s): " major-mode)
-                            "Major mode: ")
+                              (format "Mode (default %s): " major-mode)
+                            "Mode: ")
                           obarray
                           'custom-group-of-mode
                           t nil nil (if group (symbol-name major-mode))))))))