Fix some typos and some incorrectly duplicated words

David Rowley <drowley@postgresql.org>

Commit: eef231e8161eb8031a928fe48134ef25ab81fe5e
Author: David Rowley <drowley@postgresql.org>
Date: 2023-04-18T02:03:49Z
Releases: 16.0
Fix some typos and some incorrectly duplicated words

Author: Justin Pryzby
Reviewed-by: David Rowley
Discussion: https://postgr.es/m/ZD3D1QxoccnN8A1V@telsasoft.com

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