docs: adjust tag indenting and add MERGE mention

Bruce Momjian <bruce@momjian.us>

Commit: 8a300fc3afce4a0fe8a4c55bc22b2aeec092cf23
Author: Bruce Momjian <bruce@momjian.us>
Date: 2023-06-20T17:15:18Z
Releases: 16.0
docs:  adjust tag indenting and add MERGE mention

Discussion: https://postgr.es/m/CAMpnoC4_WsY3gsY+ud-Z0GDbafR=K7t7cXn2gatEqFnsRNY3yQ@mail.gmail.com

Author: Will Mortensen

Files

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doc/src/sgml/mvcc.sgml modified +11 −11

Documentation touched