patch 9.1.1409: using f-flag in 'complete' conflicts with Neovim

Problem:  using f-flag in 'complete' conflicts with Neovims filename
          completion (glepnir, after v9.1.1301).
Solution: use upper-case "F" flag for completion functions
          (Girish Palya).

fixes: #17347
closes: #17378

Signed-off-by: Girish Palya <girishji@gmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/runtime/doc/version9.txt b/runtime/doc/version9.txt
index 662cb17..5cffb63 100644
--- a/runtime/doc/version9.txt
+++ b/runtime/doc/version9.txt
@@ -41624,8 +41624,8 @@
 - New option value for 'wildmode':
 	"noselect"	- do not auto select an entry in the wildmenu
 - New flags for 'complete':
-	"f{func}"	- complete using given function
-	"f"		- complete using 'completefunc'
+	"F{func}"	- complete using given function
+	"F"		- complete using 'completefunc'
 	"o"		- complete using 'omnifunc'
 - allow to limit matches for the 'complete' sources by using the
   "{flag}^<limit>" notation