Fix some grammer errors from error messages and codes comments

Alexander Korotkov <akorotkov@postgresql.org>

Commit: df64c81ca9cba7b0fcb0ded5f735e99e676671c1
Author: Alexander Korotkov <akorotkov@postgresql.org>
Date: 2024-04-08T11:39:41Z
Releases: 17.0
Fix some grammer errors from error messages and codes comments

Discussion: https://postgr.es/m/CAHewXNkGMPU50QG7V6Q60JGFORfo8LfYO1_GCkCa0VWbmB-fEw%40mail.gmail.com
Author: Tender Wang

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