Updating the go_package as per remote branch

Author: Sai

examples/route_guide/routeguide/route_guide.proto

@@ -15,7 +15,7 @@
 syntax = "proto3";
 
 // option features.field_presence = IMPLICIT;
-option go_package = "google.golang.org/grpc/examples/route_guide/routeguide";
+option go_package = "examples/route_guide/routeguide/route_guide.proto";
 option java_multiple_files = true;
 option java_package = "io.grpc.examples.routeguide";
 option java_outer_classname = "RouteGuideProto";