runtime(doc): fix typo

Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/runtime/doc/usr_41.txt b/runtime/doc/usr_41.txt
index 8e71948..6137cfd 100644
--- a/runtime/doc/usr_41.txt
+++ b/runtime/doc/usr_41.txt
@@ -1096,7 +1096,7 @@
 	synIDattr()		get a specific attribute of a syntax ID
 	synIDtrans()		get translated syntax ID
 	synstack()		get list of syntax IDs at a specific position
-	synconcealed()		get info about (synax) concealing
+	synconcealed()		get info about (syntax) concealing
 	diff_hlID()		get highlight ID for diff mode at a position
 	matchadd()		define a pattern to highlight (a "match")
 	matchaddpos()		define a list of positions to highlight