Doc: Add a description of substream in pg_subscription.

Amit Kapila <akapila@postgresql.org>

Commit: 7efeb214ad832fa96ea950d0906b1d2b96316d15
Author: Amit Kapila <akapila@postgresql.org>
Date: 2021-03-17T02:10:23Z
Releases: 14.0
Doc: Add a description of substream in pg_subscription.

Commit 464824323e added a new column substream in pg_subscription but
forgot to update the docs.

Reported-by: Peter Smith
Author: Amit Kapila
Reviewed-by: Peter Smith
Discussion: https://postgr.es/m/CAHut+PuPGGASnh2Dy37VYODKULVQo-5oE=Shc6gwtRizDt==cA@mail.gmail.com

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doc/src/sgml/catalogs.sgml modified +10 −0

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