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/miscellaneous/file-logger/main.go

@@ -42,7 +42,7 @@ func main() {
 
 	// Navigate to http://localhost:8080/ping
 	// and open the ./logs{TODAY}.txt file.
-	if err := app.Run(iris.Addr(":8080"), iris.WithoutBanner, iris.WithoutServerError(iris.ErrServerClosed)); err != nil {
+	if err := app.Listen(":8080", iris.WithoutBanner, iris.WithoutServerError(iris.ErrServerClosed)); err != nil {
 		app.Logger().Warn("Shutdown with error: " + err.Error())
 	}
 }

_examples/miscellaneous/pprof/main.go

@@ -17,5 +17,5 @@ func main() {
 	app.Any("/debug/pprof", p)
 	app.Any("/debug/pprof/{action:path}", p)
 	//                              ___________
-	app.Run(iris.Addr(":8080"))
+	app.Listen(":8080")
 }

_examples/miscellaneous/recaptcha/custom_form/main.go

@@ -24,7 +24,7 @@ func main() {
 	// pass the middleware before the main handler or use the `recaptcha.SiteVerify`.
 	app.Post("/comment", r, postComment)
 
-	app.Run(iris.Addr(":8080"))
+	app.Listen(":8080")
 }
 
 var htmlForm = `<form action="/comment" method="POST">

_examples/miscellaneous/recaptcha/main.go

@@ -36,5 +36,5 @@ func main() {
 		ctx.Writef("succeed.")
 	})
 
-	app.Run(iris.Addr(":8080"))
+	app.Listen(":8080")
 }

_examples/miscellaneous/recover/main.go

@@ -21,7 +21,7 @@ func main() {
 	})
 
 	// http://localhost:8080, refresh it 5-6 times.
-	app.Run(iris.Addr(":8080"))
+	app.Listen(":8080")
 }
 
 // Note: