patch 9.1.0831: 'findexpr' can't be used as lambad or Funcref

Problem:  'findexpr' can't be used for lambads
          (Justin Keyes)
Solution: Replace the findexpr option with the findfunc option
          (Yegappan Lakshmanan)

related: #15905
closes: #15976

Signed-off-by: Yegappan Lakshmanan <yegappan@yahoo.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/runtime/doc/version9.txt b/runtime/doc/version9.txt
index 66f98e1..5f92503 100644
--- a/runtime/doc/version9.txt
+++ b/runtime/doc/version9.txt
@@ -41652,7 +41652,7 @@
 
 'completeitemalign'	Order of |complete-items| in Insert mode completion
 			popup
-'findexpr'		Vim expression to obtain the results for a |:find|
+'findfunc'		Vim function to obtain the results for a |:find|
 			command
 'winfixbuf'		Keep buffer focused in a window
 'tabclose'		Which tab page to focus after closing a tab page