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

closes: #17366

Signed-off-by: Doug Kearns <dougkearns@gmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>

diff --git a/runtime/doc/options.txt b/runtime/doc/options.txt
index b1f3e1506b58c244858edc8c365cb8ae1f6303a2..38eb31d33fa20f412b5a94fbcb94fed3237731d5 100644 (file)
--- 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:@")