Clean up some misplaced comments in partition_join.sql regression test.

Etsuro Fujita <efujita@postgresql.org>

Commit: e3ac8939324d73c35e2fd0f846001eb02e3a7858
Author: Etsuro Fujita <efujita@postgresql.org>
Date: 2019-12-16T08:00:16Z
Releases: 12.2
Clean up some misplaced comments in partition_join.sql regression test.

Also, add a comment explaining a test case.

Back-patch to 11 where the regression test was added.

Discussion: https://postgr.es/m/CAPmGK15adZPh2B%2BmGUjSOMH%2BH39ogDRWfCfm4G6jncZCAs9V_Q%40mail.gmail.com

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