Minor comment updates

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

Commit: d7a95f06a1a125fd82b87d01d9a9d8cf9c081799
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
Date: 2018-04-09T14:17:35Z
Releases: 11.0
Minor comment updates

Fix a couple of typos, and update a comment about why we set a BMS to
NULL.

Author: David Rowley
Discussion: http://postgr.es/m/CAKJS1f-tux=KdUz6ENJ9GHM_V2qgxysadYiOyQS9Ko9PTteVhQ@mail.gmail.com

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