pgsql: Fix typos and grammar in docs and comments

Fix typos and grammar in docs and comments

This fixes several areas of the documentation and some comments in
matters of style, grammar, or even format.

Author: Justin Pryzby
Discussion: https://postgr.es/m/20201222041153.GK30237@telsasoft.com

Branch
------
master

Details
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https://git.postgresql.org/pg/commitdiff/90fbf7c57df601c7e0b43ae7cf71f0f69908a7cc

Modified Files
--------------
contrib/pg_stat_statements/pg_stat_statements.c | 2 +-
doc/src/sgml/amcheck.sgml | 2 +-
doc/src/sgml/catalogs.sgml | 2 +-
doc/src/sgml/cube.sgml | 2 +-
doc/src/sgml/func.sgml | 8 ++++----
doc/src/sgml/logicaldecoding.sgml | 8 ++++----
doc/src/sgml/monitoring.sgml | 4 ++--
doc/src/sgml/pgstatstatements.sgml | 2 +-
doc/src/sgml/rangetypes.sgml | 2 +-
doc/src/sgml/ref/create_type.sgml | 8 ++++----
doc/src/sgml/ref/explain.sgml | 6 +++---
doc/src/sgml/ref/pg_dump.sgml | 2 +-
doc/src/sgml/ref/pg_verifybackup.sgml | 2 +-
doc/src/sgml/ref/prepare.sgml | 2 +-
doc/src/sgml/sources.sgml | 2 +-
doc/src/sgml/wal.sgml | 2 +-
src/backend/access/transam/xlog.c | 2 +-
src/backend/partitioning/partprune.c | 4 ++--
src/bin/pg_dump/pg_backup_archiver.h | 13 +++++++++----
src/bin/pg_dump/pg_backup_directory.c | 2 +-
src/bin/pg_dump/pg_dump.c | 5 +----
src/bin/pg_upgrade/check.c | 4 ++--
src/tools/msvc/README | 2 +-
23 files changed, 45 insertions(+), 43 deletions(-)