Fix typos and improve incremental sort comments

Tomas Vondra <tomas.vondra@postgresql.org>

Commit: 1a40d37a9faff562a36bd255a993fd3503bdf2b1
Author: Tomas Vondra <tomas.vondra@postgresql.org>
Date: 2020-05-12T17:37:13Z
Releases: 13.0
Fix typos and improve incremental sort comments

Author: Justin Pryzby, James Coleman
Discussion: https://postgr.es/m/20200419023625.GP26953@telsasoft.com

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