patch 8.2.1665: cannot do fuzzy string matching

Problem:    Cannot do fuzzy string matching.
Solution:   Add matchfuzzy(). (Yegappan Lakshmanan, closes #6932)
diff --git a/runtime/doc/usr_41.txt b/runtime/doc/usr_41.txt
index 1dbfba1..1e5915f 100644
--- a/runtime/doc/usr_41.txt
+++ b/runtime/doc/usr_41.txt
@@ -603,6 +603,7 @@
 	charclass()		class of a character
 	match()			position where a pattern matches in a string
 	matchend()		position where a pattern match ends in a string
+	matchfuzzy()		fuzzy matches a string in a list of strings
 	matchstr()		match of a pattern in a string
 	matchstrpos()		match and positions of a pattern in a string
 	matchlist()		like matchstr() and also return submatches