pgsql: Fix numerous typos in incremental backup commits.

Fix numerous typos in incremental backup commits.

Apparently, spell check would have been a really good idea.

Alexander Lakhin, with a few additions as per an off-list report
from Andres Freund.

Discussion: http://postgr.es/m/f08f7c60-1ad3-0b57-d580-54b11f07cddf@gmail.com

Branch
------
master

Details
-------
https://git.postgresql.org/pg/commitdiff/49f2194ed5c1f6274ac807fb033880aee0b0d1c3

Modified Files
--------------
doc/src/sgml/ref/pg_basebackup.sgml | 2 +-
doc/src/sgml/ref/pg_combinebackup.sgml | 2 +-
src/backend/backup/basebackup_incremental.c | 6 +++---
src/backend/backup/walsummaryfuncs.c | 4 ++--
src/backend/postmaster/walsummarizer.c | 21 ++++++++++-----------
src/backend/replication/walsender.c | 4 ++--
src/bin/pg_combinebackup/pg_combinebackup.c | 6 +++---
src/bin/pg_combinebackup/t/002_compare_backups.pl | 2 +-
src/bin/pg_combinebackup/t/004_manifest.pl | 2 +-
src/bin/pg_combinebackup/write_manifest.c | 2 +-
src/common/blkreftable.c | 12 ++++++------
src/include/catalog/catversion.h | 2 +-
src/include/catalog/pg_proc.dat | 2 +-
13 files changed, 33 insertions(+), 34 deletions(-)