pgsql: Fix typos in the code.

Fix typos in the code.

Author: "Dewei Dai" <daidewei1970@163.com>
Author: zengman <zengman@halodbtech.com>
Author: Zhiyuan Su <suzhiyuan_pg@126.com>
Discussion: https://postgr.es/m/2026010719201902382410@163.com
Discussion: https://postgr.es/m/tencent_4DC563C83443A4B1082D2BFF@qq.com
Discussion: https://postgr.es/m/44656d72.2a63.19b9b92b0a3.Coremail.suzhiyuan_pg@126.com

Branch
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master

Details
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https://git.postgresql.org/pg/commitdiff/31ddbb38eeff60ad5353768c7416fea3a0ecafce

Modified Files
--------------
src/backend/replication/logical/origin.c     | 2 +-
src/backend/utils/activity/pgstat_replslot.c | 3 +--
src/backend/utils/cache/lsyscache.c          | 4 ++--
3 files changed, 4 insertions(+), 5 deletions(-)