.*: fix revive package-comments lint issues (#7574)

* .*: fix revive package-comments lint issues

* add example names to package comment

* improve grammer

examples/features/csm_observability/client/main.go

@@ -16,6 +16,7 @@
  *
  */
 
+// Binary client is a client for the CSM Observability example.
 package main
 
 import (

examples/features/csm_observability/server/main.go

@@ -16,6 +16,7 @@
  *
  */
 
+// Binary server is a server for the CSM Observability example.
 package main
 
 import (

examples/features/customloadbalancer/client/main.go

@@ -16,6 +16,7 @@
  *
  */
 
+// Binary client is a client for the custom load balancer example.
 package main
 
 import (

examples/features/customloadbalancer/server/main.go

@@ -16,6 +16,7 @@
  *
  */
 
+// Binary server is a server for the custom load balancer example.
 package main
 
 import (

examples/features/opentelemetry/client/main.go

@@ -16,6 +16,7 @@
  *
  */
 
+// Binary client is a client for the OpenTelemetry example.
 package main
 
 import (

examples/features/opentelemetry/server/main.go

@@ -16,6 +16,7 @@
  *
  */
 
+// Binary server is a server for the OpenTelemetry example.
 package main
 
 import (

interop/observability/client/client.go

@@ -16,6 +16,11 @@
  *
  */
 
+// Binary client is an interop client for Observability.
+//
+// See interop test case descriptions [here].
+//
+// [here]: https://github.com/grpc/grpc/blob/master/doc/interop-test-descriptions.md
 package main
 
 import (

interop/observability/server/server.go

@@ -16,6 +16,11 @@
  *
  */
 
+// Binary server is an interop server for Observability.
+//
+// See interop test case descriptions [here].
+//
+// [here]: https://github.com/grpc/grpc/blob/master/doc/interop-test-descriptions.md
 package main
 
 import (