Encourage using grpc-netty-shaded instead of grpc-netty

grpc-netty is still really useful, but for most users who aren't doing
anything advanced using grpc-netty-shaded is much safer from a
dependency basis.

grpc-netty-shaded has seen more usage and has shown itself to be stable
and reduce the number of conflicts due to Netty versions.
diff --git a/documentation/server-reflection-tutorial.md b/documentation/server-reflection-tutorial.md
index 025d3b0..5fad5a2 100644
--- a/documentation/server-reflection-tutorial.md
+++ b/documentation/server-reflection-tutorial.md
@@ -23,7 +23,7 @@
 +++ b/examples/build.gradle
 @@ -27,6 +27,7 @@
  dependencies {
-   compile "io.grpc:grpc-netty:${grpcVersion}"
+   compile "io.grpc:grpc-netty-shaded:${grpcVersion}"
    compile "io.grpc:grpc-protobuf:${grpcVersion}"
 +  compile "io.grpc:grpc-services:${grpcVersion}"
    compile "io.grpc:grpc-stub:${grpcVersion}"