[1.8.x] Refs #24811 -- Fixed syntax error in CREATE EXTENSION example query.

       privileges, you'll have to create the extension outside of Django

       migrations with a user that has the appropriate privileges. In that

       case, connect to your Django database and run the query

       ``CREATE EXTENSION IF NOT EXISTS 'hstore';``

       ``CREATE EXTENSION IF NOT EXISTS hstore;``

    You'll see an error like ``can't adapt type 'dict'`` if you skip the first

    step, or ``type "hstore" does not exist`` if you skip the second.