Replace meta.sr.ht's /oauth endpoint with /oauth2 in comment

While there is a link to /oauth2 on the /oauth page, landing on /oauth2 right
away makes it obvious to server admins that /oauth2 is where they should be.

Discussion: <https://lists.sr.ht/~sircmpwn/sr.ht-discuss/%3C877cwnhpni.fsf%40florness.com%3E>
Signed-off-by: David Florness <david@florness.com>

gitsrht/default_query.graphql

@@ -30,7 +30,7 @@ query {
 
   # On this page, you have been automatically authorized to make API requests
   # with your sr.ht login cookie. If you wish to make GraphQL requests outside
-  # of the browser, create a personal access token at https://meta.sr.ht/oauth
+  # of the browser, create a personal access token at https://meta.sr.ht/oauth2
   #
   # curl \
   #     -H Authorization:"Bearer <your oauth token>" \