pgsql: Fix typos and grammar in code comments and docs

Fix typos and grammar in code comments and docs

Author: Alexander Lakhin
Discussion: https://postgr.es/m/f7e514cf-2446-21f1-a5d2-8c089a6e2168@gmail.com

Branch
------
master

Details
-------
https://git.postgresql.org/pg/commitdiff/4236825197e8b7f26f8fd2ce0ac287a696e7264e

Modified Files
--------------
contrib/test_decoding/specs/skip_snapshot_restore.spec | 2 +-
doc/src/sgml/xfunc.sgml | 4 ++--
src/backend/access/transam/multixact.c | 2 +-
src/backend/commands/matview.c | 2 +-
src/backend/commands/waitlsn.c | 2 +-
src/backend/executor/execExprInterp.c | 4 ++--
src/backend/postmaster/postmaster.c | 3 ++-
src/backend/replication/logical/slotsync.c | 2 +-
src/backend/storage/aio/read_stream.c | 2 +-
src/backend/storage/lmgr/lock.c | 2 +-
src/backend/utils/cache/typcache.c | 6 +++---
src/bin/pg_combinebackup/t/008_promote.pl | 4 ++--
src/bin/psql/common.c | 2 +-
src/fe_utils/astreamer_gzip.c | 2 +-
src/include/storage/read_stream.h | 1 -
src/include/utils/injection_point.h | 2 +-
src/interfaces/libpq/fe-connect.c | 2 +-
src/test/modules/test_misc/t/006_signal_autovacuum.pl | 2 +-
src/test/subscription/t/021_twophase.pl | 2 +-
19 files changed, 24 insertions(+), 24 deletions(-)