doc: Improve vague pg_createsubscriber description

Bruce Momjian <bruce@momjian.us>

Commit: 6467993fb552bda7fc1f615d90a66a16583e9998
Author: Bruce Momjian <bruce@momjian.us>
Date: 2024-08-19T22:27:22Z
Releases: 18.0
doc:  Improve vague pg_createsubscriber description

Discussion: https://postgr.es/m/ZqX_4J-nFTQtmj6K@momjian.us

Author: Euler Taveira

Backpatch-through: 17

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doc/src/sgml/ref/pg_createsubscriber.sgml modified +4 −3

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