Doc: Clarify locks taken when using ALTER TABLE ATTACH PARTITION

Michael Paquier <michael@paquier.xyz>

Commit: 4d04031dd279c4494f4e7b557844f77dec2f5322
Author: Michael Paquier <michael@paquier.xyz>
Date: 2019-11-05T01:32:43Z
Releases: 12.1
Doc: Clarify locks taken when using ALTER TABLE ATTACH PARTITION

Since 898e5e32, this command uses partially ShareUpdateExclusiveLock,
but the docs did not get the call.

Author: Justin Pryzby
Reviewed-by: Amit Langote, Álvaro Herrera, Michael Paquier
Discussion: https://postgr.es/m/20191028001207.GB23808@telsasoft.com
Backpatch-through: 12

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doc/src/sgml/ref/alter_table.sgml modified +7 −0

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