Typo fixes in comments

Correct spelling of words in source code comments.

Signed-off-by: Aaron Lehmann <aaron.lehmann@docker.com>

docs/handlers/app.go

@@ -405,7 +405,7 @@ func (app *App) configureEvents(configuration *configuration.Configuration) {
 		sinks = append(sinks, endpoint)
 	}
 
-	// NOTE(stevvooe): Moving to a new queueing implementation is as easy as
+	// NOTE(stevvooe): Moving to a new queuing implementation is as easy as
 	// replacing broadcaster with a rabbitmq implementation. It's recommended
 	// that the registry instances also act as the workers to keep deployment
 	// simple.