Fix docs for QueryChanges -> search-operators

Author: andygrunwald

changes.go

@@ -504,7 +504,7 @@ type QueryOptions struct {
 	// Clients are allowed to specify more than one query by setting the q parameter multiple times.
 	// In this case the result is an array of arrays, one per query in the same order the queries were given in.
 	//
-	// Gerrit API docs: https://gerrit-review.googlesource.com/Documentation/user-search.html#_search_operators
+	// Gerrit API docs: https://gerrit-review.googlesource.com/Documentation/user-search.html#search-operators
 	Query []string `url:"q,omitempty"`
 
 	// The n parameter can be used to limit the returned results.