pgsql: Fix misc typos, mostly in comments

Fix misc typos, mostly in comments

The only user-visible change is the fix in the "malformed
pg_dependencies" error detail. That one is new in commit e1405aa5e3ac,
so no backpatching required.

Branch
------
master

Details
-------
https://git.postgresql.org/pg/commitdiff/ad853bb877370d406864380491dfe95672867c98

Modified Files
--------------
src/backend/replication/slot.c | 2 +-
src/backend/storage/aio/aio_init.c | 4 ++--
src/backend/storage/ipc/waiteventset.c | 6 +++---
src/backend/tcop/postgres.c | 2 +-
src/backend/utils/adt/pg_dependencies.c | 2 +-
src/backend/utils/adt/ruleutils.c | 2 +-
src/backend/utils/cache/typcache.c | 2 +-
src/backend/utils/init/postinit.c | 6 +++---
src/common/unicode_norm.c | 2 +-
src/include/lib/ilist.h | 2 +-
src/interfaces/libpq/t/004_load_balance_dns.pl | 4 ++--
src/test/regress/expected/foreign_key.out | 2 +-
src/test/regress/expected/lock.out | 2 +-
src/test/regress/expected/partition_join.out | 2 +-
src/test/regress/expected/pg_dependencies.out | 8 ++++----
src/test/regress/expected/without_overlaps.out | 8 ++++----
src/test/regress/sql/foreign_key.sql | 2 +-
src/test/regress/sql/lock.sql | 2 +-
src/test/regress/sql/partition_join.sql | 2 +-
src/test/regress/sql/without_overlaps.sql | 8 ++++----
20 files changed, 35 insertions(+), 35 deletions(-)