docs: minor wording and cleanup in graceful shutdown example (#248)

Co-authored-by: Bo-Yi Wu <[email protected]>

Author: guerzon

content/en/docs/examples/graceful-restart-or-stop.md

@@ -21,7 +21,7 @@ An alternative to endless:
 * [graceful](https://github.com/tylerb/graceful): Graceful is a Go package enabling graceful shutdown of an http.Handler server.
 * [grace](https://github.com/facebookgo/grace): Graceful restart & zero downtime deploy for Go servers.
 
-If you are using Go 1.8, you may not need to use this library! Consider using http.Server's built-in [Shutdown()](https://golang.org/pkg/net/http/#Server.Shutdown) method for graceful shutdowns. See the full [graceful-shutdown](https://github.com/gin-gonic/examples/tree/master/graceful-shutdown) example with gin.
+If you are using Go 1.8 and later, you may not need to use this library! Consider using `http.Server`'s built-in [Shutdown()](https://golang.org/pkg/net/http/#Server.Shutdown) method for graceful shutdowns. See the full [graceful-shutdown](https://github.com/gin-gonic/examples/tree/master/graceful-shutdown) example with gin.
 
 ```go
 //go:build go1.8
@@ -63,7 +63,7 @@ func main() {
 	// Wait for interrupt signal to gracefully shutdown the server with
 	// a timeout of 5 seconds.
 	quit := make(chan os.Signal, 1)
-	// kill (no param) default send syscall.SIGTERM
+	// kill (no params) by default sends syscall.SIGTERM
 	// kill -2 is syscall.SIGINT
 	// kill -9 is syscall.SIGKILL but can't be caught, so don't need add it
 	signal.Notify(quit, syscall.SIGINT, syscall.SIGTERM)