regexp: fix incorrect name in Match doc comment

Change-Id: I628aad9a3abe9cc0c3233f476960e53bd291eca9
Reviewed-on: https://go-review.googlesource.com/135235Reviewed-by: Ralph Corderoy <ralph@inputplus.co.uk>
Reviewed-by: Ian Lance Taylor <iant@golang.org>

src/regexp/regexp.go

@@ -469,7 +469,7 @@ func MatchString(pattern string, s string) (matched bool, err error) {
 	return re.MatchString(s), nil
 }
 
-// MatchString reports whether the byte slice b
+// Match reports whether the byte slice b
 // contains any match of the regular expression pattern.
 // More complicated queries need to use Compile and the full Regexp interface.
 func Match(pattern string, b []byte) (matched bool, err error) {