Fixed example using ioutil

Author: Azuki-bar

website/content/guide/customization.md

@@ -55,7 +55,7 @@ if l, ok := e.Logger.(*log.Logger); ok {
 `Echo#Logger.SetOutput(io.Writer)` can be used to set the output destination for
 the logger. Default value is `os.Stdout`
 
-To completely disable logs use `Echo#Logger.SetOutput(ioutil.Discard)` or `Echo#Logger.SetLevel(log.OFF)`
+To completely disable logs use `Echo#Logger.SetOutput(io.Discard)` or `Echo#Logger.SetLevel(log.OFF)`
 
 ### Log Level
 

website/content/guide/routing.md

@@ -173,7 +173,7 @@ data, err := json.MarshalIndent(e.Routes(), "", "  ")
 if err != nil {
 	return err
 }
-ioutil.WriteFile("routes.json", data, 0644)
+os.WriteFile("routes.json", data, 0644)
 ```
 
 `routes.json`