copy cleanup, remove feature not present in pr

docs/v2/manual.md

@@ -644,14 +644,10 @@ func main() {
 
 #### Required Flags
 
-You can make a flag required by setting the `Required` field to `true`. If an end-user
-fails to provide a required flag, they will be shown a default error message, or a
-custom message if one is defined. To define a custom error message for a required flag,
-set the `RequiredFlagErr` field equal to a `cli.FlagErr` struct with a `Custom` field of `true`
-and a `Message` field containing the custom error message. Default and custom error messages
-can be mixed with default messages displayed before custom messages.
+You can make a flag required by setting the `Required` field to `true`. If a user
+does not provide a required flag, they will be shown an error message.
 
-For example this:
+Take for example this app that reqiures the `lang` flag:
 
 ```go
 package main
@@ -673,34 +669,18 @@ func main() {
       Value: "english",
       Usage: "language for the greeting",
       Required: true,
-      RequiredFlagErr: cli.FlagErr{
-        Custom: true,
-        Message: `There's a problem: "lang" is a required flag` ,
-      },
-    },
-    cli.StringFlag{
-      Name: "mood",
-      Value: "normal",
-      Usage: "emphasis for the greeting",
-      Required: true,
     },
   }
 
   app.Action = func(c *cli.Context) error {
-    name := "Nefertiti"
-    if c.NArg() > 0 {
-      name = c.Args().Get(0)
-    }
+
     var output string
     if c.String("lang") == "spanish" {
-      output = "Hola " + name
+      output = "Hola"
     } else {
-      output = "Hello " + name
-    }
-
-    if c.String("mood") == "excited" {
-      output = strings.ToUpper(output)
+      output = "Hello"
     }
+    fmt.Println(output)
 
     return nil
   }
@@ -712,13 +692,10 @@ func main() {
 }
 ```
 
-Creates an app that requires both `lang` and `mood` flags. If an attempt
-to run the app is made without either, the end-user will see the following
-prompts:
+If the app is run without the `lang` flag, the user will see the following message
 
 ```
-Required flag "mood" not set
-There's a problem: "lang" is a required flag
+Required flag "lang" not set
 ```
 
 #### Default Values for help output