removal of timestamp flag doc

docs/v2/manual.md

@@ -1150,43 +1150,6 @@ The default version flag (`-v/--version`) is defined as `cli.VersionFlag`, which
 is checked by the cli internals in order to print the `App.Version` via
 `cli.VersionPrinter` and break execution.
 
-### Timestamp Flag
-
-Using the timestamp flag is simple, You can look at time.Parse to get layout examples : https://golang.org/pkg/time/#example_Parse 
-
-<!-- {
-  "args": ["&#45;&#45;meeting", "2019-08-12T15:04:05"],
-  "output": "\"2019-08-12 15:04:05 +0000 UTC\""
-} -->
-``` go
-package main
-
-import (
-  "fmt"
-  "log"
-  "os"
-
-  "github.com/urfave/cli/v2"
-)
-
-func main() {
-  app := &cli.App{
-    Flags: []cli.Flag {
-      &cli.TimestampFlag{Name: "meeting", Layout: "2006-01-02T15:04:05"},
-    },
-    Action: func(c *cli.Context) error {
-      fmt.Printf("%#v",c.Timestamp("meeting").String())
-      return nil
-    },
-  }
-
-  err := app.Run(os.Args)
-  if err != nil {
-    log.Fatal(err)
-  }
-}
-```
-
 #### Customization
 
 The default flag may be customized to something other than `-v/--version` by