Fix dead link in doc
@ -4,7 +4,7 @@ Interoperability Test Case Descriptions
Client and server use
[test.proto](https://github.com/grpc/grpc/blob/master/test/proto/test.proto)
and the [gRPC over HTTP/2 v2
protocol](doc/PROTOCOL-HTTP2.md).
protocol](https://github.com/grpc/grpc/blob/master/doc/PROTOCOL-HTTP2.md).
Client
------