runtime(doc): document that the diff filetype uses Diff hl groups

Commit: 
https://github.com/vim/vim/commit/b1392bee701d887b66b596c9af26bfcb6f0614b8
Author: Christian Brabandt <[email protected]>
Date:   Wed Jan 3 17:59:38 2024 +0100

    runtime(doc): document that the diff filetype uses Diff hl groups
    
    related: https://github.com/vim/vim/issues/13776
    
    Signed-off-by: Christian Brabandt <[email protected]>

diff --git a/runtime/doc/syntax.txt b/runtime/doc/syntax.txt
index 040780b35..bc833b11f 100644
--- a/runtime/doc/syntax.txt
+++ b/runtime/doc/syntax.txt
@@ -1,4 +1,4 @@
-*syntax.txt*   For Vim version 9.1.  Last change: 2023 Dec 27
+*syntax.txt*   For Vim version 9.1.  Last change: 2024 Jan 03
 
 
                  VIM REFERENCE MANUAL    by Bram Moolenaar
@@ -1261,7 +1261,7 @@ To highlight KDE-reserved features, set >
 g:desktop_enable_kde follows g:desktop_enable_nonstd if not supplied
 
 
-DIFF                                                   *diff.vim*
+DIFF                                           *diff.vim* *ft-diff-syntax*
 
 The diff highlighting normally finds translated headers.  This can be slow if
 there are very long lines in the file.  To disable translations: >
@@ -1270,7 +1270,15 @@ there are very long lines in the file.  To disable 
translations: >
 
 Also see |diff-slow|.
 
+Since the Vim 9.1 release |version-9.1| the diff filetype links the diffAdded,
+diffRemoved and diffChanged highlighting groups to |hl-DiffAdd|,
+|hl-DiffDelete| and |hl-DiffChange| by default.  If you do not want this, you
+can change it to the previous groups like this in your |.vimrc| >
 
+       hi link diffRemoved Special
+       hi link diffChanged PreProc
+       hi link diffAdded Identifier
+<
 DIRCOLORS                             *dircolors.vim* *ft-dircolors-syntax*
 
 The dircolors utility highlighting definition has one option.  It exists to
diff --git a/runtime/doc/tags b/runtime/doc/tags
index 215e18984..e8ac2bc19 100644
--- a/runtime/doc/tags
+++ b/runtime/doc/tags
@@ -7207,6 +7207,7 @@ ft-cynlib-syntax  syntax.txt      /*ft-cynlib-syntax*
 ft-dart-syntax syntax.txt      /*ft-dart-syntax*
 ft-dash-syntax syntax.txt      /*ft-dash-syntax*
 ft-desktop-syntax      syntax.txt      /*ft-desktop-syntax*
+ft-diff-syntax syntax.txt      /*ft-diff-syntax*
 ft-dircolors-syntax    syntax.txt      /*ft-dircolors-syntax*
 ft-docbk-syntax        syntax.txt      /*ft-docbk-syntax*
 ft-docbksgml-syntax    syntax.txt      /*ft-docbksgml-syntax*

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