Fix collection of typos and grammar mistakes in docs and comments

Michael Paquier <michael@paquier.xyz>

Commit: 148266fa354a47543f6c0325cd1ea900ead4aac6
Author: Michael Paquier <michael@paquier.xyz>
Date: 2019-04-19T07:57:40Z
Releases: 12.0
Fix collection of typos and grammar mistakes in docs and comments

Author: Justin Pryzby
Discussion: https://postgr.es/m/20190330224333.GQ5815@telsasoft.com

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