runtime(doc): mention 'findfunc' at :h :find

fixes: #18250
related: #18253

Signed-off-by: Girish Palya <girishji@gmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>

Author: girishji

runtime/doc/editing.txt

@@ -1,4 +1,4 @@
-*editing.txt*   For Vim version 9.1.  Last change: 2025 Aug 06
+*editing.txt*   For Vim version 9.1.  Last change: 2025 Sep 09
 
 
 		  VIM REFERENCE MANUAL    by Bram Moolenaar
@@ -247,6 +247,7 @@ If you want to keep the changed buffer without saving it, switch on the
 							*:fin* *:find*
 :fin[d][!] [++opt] [+cmd] {file}
 			Find {file} in 'path' and then |:edit| it.
+			See also: 'findfunc'.
 
 :{count}fin[d][!] [++opt] [+cmd] {file}
 			Just like ":find", but use the {count} match in