Review comments.

Co-authored-by: Travis Ralston <travpc@gmail.com>

changelogs/client_server/newsfragments/2709.new

@@ -1 +1 @@
-Document `MSC2604: Parameters for Login Fallback <https://github.com/matrix-org/matrix-doc/pull/2604>`_.
+Add a ``device_id`` parameter to login fallback per `MSC2604 <https://github.com/matrix-org/matrix-doc/pull/2604>`_.

specification/client_server_api.rst

@@ -1096,8 +1096,8 @@ This returns an HTML and JavaScript page which can perform the entire login
 process. The page will attempt to call the JavaScript function
 ``window.onLogin`` when login has been successfully completed.
 
-Non-credential related parameters of the login endpoint can be provided as query
-parameters, for example the ``device_id`` or ``initial_device_display_name``.
+Non-credential parameters valid for the ``/login`` endpoint can be provided as query
+string parameters here. For example::
 These are to be forwarded to the login endpoint during the login process.
 
     GET /_matrix/static/client/login/?device_id=GHTYAJCE