Doc: document autovacuum interruption.

Amit Kapila <akapila@postgresql.org>

Commit: 62ed5e77f3dc6d8c65d917b60dc8512ddd6fd18e
Author: Amit Kapila <akapila@postgresql.org>
Date: 2019-09-19T03:28:11Z
Releases: 12.0
Doc: document autovacuum interruption.

It's important users be able to know (without looking at the source code)
that running DDL or DDL-like commands can interrupt autovacuum which can
lead to a lot of dead tuples and hence slower database operations.

Reported-by: James Coleman
Author: James Coleman
Reviewed-by: Amit Kapila
Backpatch-through: 9.4
Discussion: https://postgr.es/m/CAAaqYe-XYyNwML1=f=gnd0qWg46PnvD=BDrCZ5-L94B887XVxQ@mail.gmail.com

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