Update docs re: grpc-netty issues (#909)
Update docs re: grpc-netty issues (#909)

* Update docs re: grpc-netty issues

* Update grpc.md

Thank you!

Co-authored-by: Nadav Samet <0b8a2bb830ce6d2c4671a28ec7d6135c2e3749b7@gmail.com>
scalapb/ScalaPB,scalapb/ScalaPB,scalapb/ScalaPB,trueaccord/ScalaPB,scalapb/ScalaPB