bug#74367: [PATCH] c-ts-mode.el: Adjust doc about how to change default modes

[Stefan Monnier via "Bug reports for GNU Emacs, the Swiss army knife of text editors" <bug-gnu-emacs@gnu.org>]

So, for `emacs-30` I propose the patch below.
Any objection?


        Stefan


diff --git a/lisp/progmodes/c-ts-mode.el b/lisp/progmodes/c-ts-mode.el
index 2785e9a6e68..af23cd66d98 100644
--- a/lisp/progmodes/c-ts-mode.el
+++ b/lisp/progmodes/c-ts-mode.el
@@ -35,12 +35,6 @@
 ;; To use these modes by default, assuming you have the respective
 ;; tree-sitter grammars available, do one of the following:
 ;;
-;; - If you have both C and C++ grammars installed, add
-;;
-;;    (require 'c-ts-mode)
-;;
-;;   to your init file.
-;;
 ;; - Add one or mode of the following to your init file:
 ;;
 ;;    (add-to-list 'major-mode-remap-alist '(c-mode . c-ts-mode))
@@ -59,6 +53,12 @@
 ;;
 ;;   will turn on the c++-ts-mode for C++ source files.
 ;;
+;; - If you have both C and C++ grammars installed, add
+;;
+;;    (require 'c-ts-mode)
+;;
+;;   to your init file.
+;;
 ;; You can also turn on these modes manually in a buffer.  Doing so
 ;; will set up Emacs to use the C/C++ modes defined here for other
 ;; files, provided that you have the corresponding parser grammar
@@ -1496,7 +1496,6 @@ c-or-c++-ts-mode
                  '(c++-mode . c++-ts-mode)))
 
 (when (treesit-ready-p 'c)
-  (add-to-list 'major-mode-remap-defaults '(c++-mode . c++-ts-mode))
   (add-to-list 'major-mode-remap-defaults '(c-mode . c-ts-mode)))
 
 (when (and (treesit-ready-p 'cpp)