Fix typos in decode.c and logical.c.

Amit Kapila <akapila@postgresql.org>

Commit: e02e840ff7787d4798fca9f6a5b8b3657f45cf0c
Author: Amit Kapila <akapila@postgresql.org>
Date: 2021-01-06T03:26:19Z
Releases: 14.0
Fix typos in decode.c and logical.c.

Per report by Ajin Cherian in email:
https://postgr.es/m/CAFPTHDYnRKDvzgDxoMn_CKqXA-D0MtrbyJvfvjBsO4G=UHDXkg@mail.gmail.com

Files