Improve documentation

Link

https://supabase.com/docs/guides/database/extensions/pg_cron?queryGroups=database-method&database-method=sql

Add a link to the page which needs improvement (if relevant)

Describe the problem

Is the documentation missing? Or is it confusing? Why is it confusing?

When following the SQL instructions on local development with the CLI, the first step specifies an incorrect schema:

postgres=> create extension pg_cron with schema extensions;
ERROR:  extension "pg_cron" must be installed in schema "pg_catalog"

That's on a freshly supabase db reset database with CLI version 1.187.8. When I try to activate it via the UI, it says it must be installed in the pg_catalog schema as well, so I did that in the CLI:

postgres=> create extension pg_cron with schema pg_catalog;
CREATE EXTENSION

which seems to work just fine.

Describe the improvement

A clear and concise description of the improvement.

Change the initial install step to use the correct schema, pg_catalog.

Additional context

Add any other context or screenshots that help clarify your question.