Update renamed command
Rationale:
warning: The 'create-migration' subcommand was renamed.
Use 'edgedb migration create' instead.
@@ -200,7 +200,7 @@ these questions to make sure you aren't making any unintended changes.
.. code-block:: bash
- $ edgedb create-migration
+ $ edgedb migration create
did you create object type 'default::Person'? [y,n,l,c,b,s,q,?]
> y
did you create object type 'default::Movie'? [y,n,l,c,b,s,q,?]
