documentation: Adds package level comments (#2612)

* ADDED package level comments for: benchmark/, examples/helloworld/

* UPDATED code to run gofmt

* FIXED linter errors

* FIXED spelling error

* FIXED documentation based on feedback

* FIXED comment to add pointer to another file

* ADDED reference to start server

* ADDED fix to include command to start server

benchmark/client/main.go

@@ -16,6 +16,26 @@
  *
  */
 
+/*
+Package main provides a client used for benchmarking.  Before running the
+client, the user would need to launch the grpc server.
+
+To start the server before running the client, you can run look for the command
+under the following file:
+
+	benchmark/server/main.go
+
+After starting the server, the client can be run.  An example of how to run this
+command is:
+
+go run benchmark/client/main.go -test_name=grpc_test
+
+If the server is running on a different port than 50051, then use the port flag
+for the client to hit the server on the correct port.
+An example for how to run this command on a different port can be found here:
+
+go run benchmark/client/main.go -test_name=grpc_test -port=8080
+*/
 package main
 
 import (

benchmark/server/main.go

@@ -16,6 +16,15 @@
  *
  */
 
+/*
+Package main provides a server used for benchmarking.  It launches a server
+which is listening on port 50051.  An example to start the server can be found
+at:
+	go run benchmark/server/main.go -test_name=grpc_test
+
+After starting the server, the client can be run separately and used to test
+qps and latency.
+*/
 package main
 
 import (

benchmark/stats/stats.go

@@ -16,6 +16,7 @@
  *
  */
 
+// Package stats registers stats used for creating benchmarks
 package stats
 
 import (

examples/helloworld/greeter_client/main.go

@@ -16,6 +16,7 @@
  *
  */
 
+// Package main implements a client for Greeter service.
 package main
 
 import (

examples/helloworld/greeter_server/main.go

@@ -18,6 +18,7 @@
 
 //go:generate protoc -I ../helloworld --go_out=plugins=grpc:../helloworld ../helloworld/helloworld.proto
 
+// Package main implements a server for Greeter service.
 package main
 
 import (