pgsql: Update stale comments, and fix comment typos.

Update stale comments, and fix comment typos.

Branch
------
master

Details
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https://git.postgresql.org/pg/commitdiff/31d250e049b4e3d51a635edaa2221c11815e40e7

Modified Files
--------------
src/backend/access/brin/brin_inclusion.c |  2 +-
src/backend/access/transam/multixact.c   |  2 +-
src/backend/port/sysv_shmem.c            |  6 +++---
src/backend/postmaster/postmaster.c      |  4 ++--
src/backend/utils/adt/like.c             |  1 -
src/bin/pg_basebackup/pg_basebackup.c    |  7 +------
src/bin/pg_rewind/t/RewindTest.pm        |  6 +-----
src/bin/pg_upgrade/TESTING               |  2 +-
src/bin/pg_upgrade/controldata.c         |  2 +-
src/fe_utils/string_utils.c              |  3 +--
src/include/storage/s_lock.h             |  3 +--
src/interfaces/libpq/fe-secure-openssl.c |  2 +-
src/test/recovery/t/013_crash_restart.pl | 13 ++++++-------
13 files changed, 20 insertions(+), 33 deletions(-)