message: docs: fix /frame/handler => /handler/frame typo
diff: @@ -49,7 +49,7 @@ the user to initiate a login. This login request is done to the `/start`
  endpoint which is handled by the `start` method.
  The `start` method re-directs to the external auth provider who authenticates
  -the request and re-directs the request to the `/frame/handler` endpoint, which
  +the request and re-directs the request to the `/handler/frame` endpoint, which
  is handled by the `frameHandler` method.
  The `frameHandler` returns an HTML response, containing a script that does a
  