Corrected headings in migration docs.

docs/ref/migration-operations.txt

@@ -102,7 +102,7 @@ subclass).
 AlterOrderWithRespectTo
 -----------------------
 
-.. class:: AlterIndexTogether(name, order_with_respect_to)
+.. class:: AlterOrderWithRespectTo(name, order_with_respect_to)
 
 Makes or deletes the ``_order`` column needed for the
 :attr:`~django.db.models.Options.order_with_respect_to` option on the ``Meta``
@@ -111,11 +111,12 @@ subclass.
 AlterModelOptions
 -----------------
 
-.. class:: AlterIndexTogether(name, options)
+.. class:: AlterModelOptions(name, options)
 
 Stores changes to miscellaneous model options (settings on a model's ``Meta``)
 like ``permissions`` and ``verbose_name``. Does not affect the database, but
-persists these changes for :class:`RunPython` instances to use.
+persists these changes for :class:`RunPython` instances to use. ``options``
+should be a dictionary mapping option names to values.
 
 AddField
 --------