docs: add JWT-Standard format to token overview (#623)

Author: dacongda

docs/token/overview.md

@@ -26,7 +26,8 @@ After logging into the application, there are three options to generate a JWT To
 - `JWT`
 - `JWT-Empty`
 - `JWT-Custom`
+- `JWT-Standard`
 
-The options are as follows: JWT will generate a token containing all User fields, JWT-Empty will generate a token with all non-empty values for the user, and JWT-Custom will generate a token containing custom User Token fields (you can choose attributes in the Token fields).
+The options are as follows: JWT will generate a token containing all User fields, JWT-Empty will generate a token with all non-empty values for the user, and JWT-Custom will generate a token containing custom User Token fields (you can choose attributes in the Token fields). JWT-Standard will generate a token with some standard OIDC token fields include email, phone, gender and Address (Address value in other format is not standard).
 
 ![JWT-Custom](/img/token/overview/JWT-Custom.png)