examples: replace all app.Run(iris.Addr(...)) with app.Listen just for the shake of simplicity, both are doing the same exact thing as it's described on the http listening first example.

Former-commit-id: d20afb2e899aee658a8e0ed1693357798df93462

_examples/http_request/request-logger/request-logger-file/main.go

@@ -35,7 +35,7 @@ func main() {
 	// http://localhost:8080/1
 	// http://localhost:8080/2
 	// http://lcoalhost:8080/notfoundhere
-	app.Run(iris.Addr(":8080"), iris.WithoutServerError(iris.ErrServerClosed))
+	app.Listen(":8080", iris.WithoutServerError(iris.ErrServerClosed))
 }
 
 // get a filename based on the date, file logs works that way the most times