Improve error message for pg_create_subscription.

Nathan Bossart <nathan@postgresql.org>

Commit: 4d5105a684ba20bf6a98e6ae48224fe93382c040
Author: Nathan Bossart <nathan@postgresql.org>
Date: 2023-05-12T21:16:56Z
Releases: 16.0
Improve error message for pg_create_subscription.

c3afe8cf5a updated this error message, but it didn't use the new
style established in de4d456b40.

Reviewed-by: Tom Lane
Discussion: https://postgr.es/m/20230512203721.GA2644063%40nathanxps13.home

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