Remove duplicate words in docs and code comments.

Amit Kapila <akapila@postgresql.org>

Commit: 7cc2f59dd57ab275497ae42a4f98e7936e1e3723
Author: Amit Kapila <akapila@postgresql.org>
Date: 2023-10-09T03:48:47Z
Releases: 17.0
Remove duplicate words in docs and code comments.

Additionally, add a missing "the" in a couple of places.

Author: Vignesh C, Dagfinn Ilmari Mannsåker
Discussion: http://postgr.es/m/CALDaNm28t+wWyPfuyqEaARS810Je=dRFkaPertaLAEJYY2cWYQ@mail.gmail.com

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