Merge pull request #1539 from urfave/issue_1276

Docs:(issue_1276) Make destination/value/default text clear

Author: dearchap

docs/v2/examples/flags.md

@@ -51,7 +51,8 @@ func main() {
 ```
 
 You can also set a destination variable for a flag, to which the content will be
-scanned.
+scanned. Note that if the `Value` is set for the flag, it will be shown as default,
+and destination will be set to this value before parsing flag on the command line.
 
 <!-- {
   "output": "Hello someone"