pgsql: Fix collection of typos in the code and the documentation

Fix collection of typos in the code and the documentation

Some words were duplicated while other places were grammatically
incorrect, including one variable name in the code.

Author: Otto Kekalainen, Justin Pryzby
Discussion: https://postgr.es/m/7DDBEFC5-09B6-4325-B942-B563D1A24BDC@amazon.com

Branch
------
master

Details
-------
https://git.postgresql.org/pg/commitdiff/6bdf1a1400d3fb8c87e020be943942dcab7e75e2

Modified Files
--------------
config/pkg.m4                                     |  2 +-
contrib/pageinspect/expected/gist.out             |  2 +-
contrib/pageinspect/sql/gist.sql                  |  2 +-
doc/src/sgml/config.sgml                          |  4 ++--
doc/src/sgml/logicaldecoding.sgml                 | 10 +++++-----
doc/src/sgml/postgres-fdw.sgml                    |  2 +-
src/backend/access/heap/pruneheap.c               |  2 +-
src/backend/access/transam/xlog.c                 |  2 +-
src/backend/catalog/index.c                       |  2 +-
src/backend/commands/explain.c                    |  6 +++---
src/backend/main/main.c                           |  2 +-
src/backend/postmaster/bgworker.c                 |  2 +-
src/backend/replication/basebackup_sink.c         |  4 ++--
src/backend/utils/adt/tsrank.c                    |  2 +-
src/bin/pg_basebackup/pg_basebackup.c             |  2 +-
src/bin/pg_basebackup/t/010_pg_basebackup.pl      |  4 ++--
src/bin/pg_verifybackup/t/008_untar.pl            |  2 +-
src/bin/pg_verifybackup/t/010_client_untar.pl     |  2 +-
src/bin/pgbench/pgbench.c                         |  2 +-
src/include/libpq/sasl.h                          |  2 +-
src/interfaces/libpq/t/001_uri.pl                 |  2 +-
src/test/perl/PostgreSQL/Test/Cluster.pm          |  6 +++---
src/test/regress/expected/create_function_sql.out |  2 +-
src/test/regress/expected/create_table.out        |  2 +-
src/test/regress/expected/object_address.out      |  2 +-
src/test/regress/sql/create_function_sql.sql      |  2 +-
src/test/regress/sql/create_table.sql             |  2 +-
src/test/regress/sql/object_address.sql           |  2 +-
src/test/subscription/t/001_rep_changes.pl        |  2 +-
29 files changed, 40 insertions(+), 40 deletions(-)