[1.7.x] Refs #25144 -- Revised deprecation timeline: migrations won't…

… become compulsory.

Backport of e133b55 from master

docs/internals/deprecation.txt

@@ -32,9 +32,12 @@ details on these changes.
 * ``allow_syncdb`` on database routers will no longer automatically become
   ``allow_migrate``.
 
-* The legacy method of syncing apps without migrations will be removed,
-  and migrations will become compulsory for all apps. This includes automatic
-  loading of ``initial_data`` fixtures and support for initial SQL data.
+* Automatic syncing of apps without migrations will be removed. Migrations will
+  become compulsory for all apps unless you pass the ``--run-syncdb`` option to
+  ``migrate``.
+
+* Support for automatic loading of ``initial_data`` fixtures and initial SQL
+  data will be removed.
 
 * All models will need to be defined inside an installed application or
   declare an explicit :attr:`~django.db.models.Options.app_label`.