runtime(doc): Correct allowed characters at :help 'filetype'

Commit: 
https://github.com/vim/vim/commit/a6172f8c5ce136d877965bf49881fc6e71ea4edf
Author: Doug Kearns <dougkea...@gmail.com>
Date:   Mon May 26 20:32:35 2025 +0200

    runtime(doc): Correct allowed characters at :help 'filetype'
    
    closes: https://github.com/vim/vim/issues/17366
    
    Signed-off-by: Doug Kearns <dougkea...@gmail.com>
    Signed-off-by: Christian Brabandt <c...@256bit.org>

diff --git a/runtime/doc/options.txt b/runtime/doc/options.txt
index b1f3e1506..38eb31d33 100644
--- a/runtime/doc/options.txt
+++ b/runtime/doc/options.txt
@@ -3633,7 +3633,8 @@ A jump table for the options with a short description can 
be found at |Q_op|.
        one dot may appear.
        This option is not copied to another buffer, independent of the 's' or
        'S' flag in 'cpoptions'.
-       Only alphanumeric characters, '-' and '_' can be used.
+       Only alphanumeric characters, '-' and '_' can be used (and a '.' is 
+       allowed as delimiter when combining different filetypes).
 
                                                *'fillchars'* *'fcs'*
 'fillchars' 'fcs'      string  (default "vert:|,fold:-,eob:~,lastline:@")

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