Updated Excel and VBA (markdown)

Excel-and-VBA.md

@@ -12,9 +12,11 @@ For example, with using curl, you first login with admin credentials,
 by sending username and password to url.
 Change your server url etc details to below:
 
+Login with as JSON https://github.com/wekan/wekan/wiki/REST-API#example-call---as-json
 ```
-curl http://localhost:3000/users/login \
--d "username=USER&password=PASSWORD"
+curl -H "Content-type:application/json" \
+      http://localhost:3000/users/login \
+      -d '{ "email": "my@email.com", "password": "mypassword" }'
 ```
 =>
 ```