Doc: Miscellaneous doc updates for MERGE.

Dean Rasheed <dean.a.rasheed@gmail.com>

Commit: ee7e8f3838733f09a67e1421f0d7c6498cd68ab0
Author: Dean Rasheed <dean.a.rasheed@gmail.com>
Date: 2023-02-26T09:06:04Z
Releases: 16.0
Doc: Miscellaneous doc updates for MERGE.

Update a few places in the documentation that should mention MERGE
among the list of applicable commands. In a couple of places, a
slightly more detailed description of what happens for MERGE seems
appropriate.

Reviewed by Alvaro Herrera.

Discussion: http://postgr.es/m/CAEZATCWqHLcxab89ATMQZNGFG_mxDPM%2BjzkSbXKD3JYPfRGvtw%40mail.gmail.com

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