datastore: fix typo
@@ -443,7 +443,7 @@ func (q *Query) toProto(req *pb.RunQueryRequest) error {
// Count returns the number of results for the given query.
//
// The running time and number of API calls made by Count scale linearly with
-// with the sum of the query's offset and limit. Unless the result count is
+// the sum of the query's offset and limit. Unless the result count is
// expected to be small, it is best to specify a limit; otherwise Count will
// continue until it finishes counting or the provided context expires.
func (c *Client) Count(ctx context.Context, q *Query) (n int, err error) {
