Docs update

Signed-off-by: Lukasz Gryglicki <lgryglicki@cncf.io>

Author: lukaszgryglicki

cla-backend/cla/routes.py

@@ -1834,7 +1834,10 @@ def user_from_session(request, response):
       "version": "v1"
     }
     Can also return 302 redirect (if redirect mode is set redirect=1|yes|true)
-    Can also return 202 redirect_url for GitHub OAuth2 if redirect mode is not set (redirect=0|no|false)
+    Can also return 202 redirect_url for GitHub OAuth2 if redirect mode is not set (redirect=0|no|false) with payload:
+    {
+        "redirect_url": "https://github.com/login/oauth/authorize?response_type=code&client_id=38f6d46ff92b7ed04071&redirect_uri=abc&scope=user%3Aemail&state=VCshZQtMs0hPMw6XuMBBZODVaWAxXX"
+    }
     Can also return 404 on OAuth2 errors or missing redirect_url when no session present
     return_url should ideally be "CLA contributor console" URL + /v2/user-from-session, Github will add "?state=xyz&code=xyz"
     """