Document lock obtained during partition detach

Alvaro Herrera <alvherre@alvh.no-ip.org>

Commit: 366aa374b315667fe44480ec8934cb1034ba0930
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
Date: 2021-03-25T19:30:22Z
Releases: 12.7
Document lock obtained during partition detach

On partition detach, we acquire a SHARE lock on all tables that
reference the partitioned table that we're detaching a partition from,
but failed to document this fact.  My oversight in commit f56f8f8da6af.
Repair.  Backpatch to 12.

Author: Álvaro Herrera <alvherre@alvh.no-ip.org>
Discussion: https://postgr.es/m/20210325180244.GA12738@alvherre.pgsql

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doc/src/sgml/ref/alter_table.sgml modified +2 −0

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