Fix a couple of typos

Michael Paquier <michael@paquier.xyz>

Commit: 88199b9d5fda605360ac903dd9d3de0ca36f0b8c
Author: Michael Paquier <michael@paquier.xyz>
Date: 2023-03-21T23:44:59Z
Releases: 16.0
Fix a couple of typos

PL/pgSQL was misspelled in a few places, so fix these.

Author: Zhang Mingli
Reviewed-by: Richard Guo
Discussion: https://postgr.es/m/1bd41572-9cd9-465e-9f59-ee45385e51b4@Spark

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