Update public schema notice

[zackkrida]

Fixes #3712

This PR updates the language for the public schema notice to better reflect the default behavior of PostgreSQL versions 15 and above.

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[zackkrida]

@mathemancer assigning you here to confirm that the language matches Postgres behavior correctly. Thanks!

[mathemancer]

Made a small suggestion.

[zackkrida]

Great suggestion, thanks @mathemancer. Ready for re-review.

[mathemancer]

LGTM!