Fix typos and inconsistencies in code comments

Michael Paquier <michael@paquier.xyz>

Commit: f43608bda2111a1fda514d1bed4df313ee2bbec3
Author: Michael Paquier <michael@paquier.xyz>
Date: 2019-06-14T00:34:34Z
Releases: 12.0
Fix typos and inconsistencies in code comments

Author: Alexander Lakhin
Discussion: https://postgr.es/m/dec6aae8-2d63-639f-4d50-20e229fb83e3@gmail.com

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