pgsql: Fix collection of typos and grammar mistakes in the tree

Fix collection of typos and grammar mistakes in the tree

This fixes some comments and documentation new as of Postgres 13.

Author: Justin Pryzby
Discussion: /messages/by-id/20200408165653.GF2228@telsasoft.com

Branch
------
master

Details
-------
https://git.postgresql.org/pg/commitdiff/dd0f37eccecc2db5c0ffafefbf697a2c916e8bc3

Modified Files
--------------
doc/src/sgml/btree.sgml | 2 +-
doc/src/sgml/catalogs.sgml | 2 +-
doc/src/sgml/config.sgml | 10 +++++-----
doc/src/sgml/func.sgml | 8 ++++----
doc/src/sgml/libpq.sgml | 2 +-
doc/src/sgml/ref/pg_validatebackup.sgml | 4 ++--
src/backend/commands/tablecmds.c | 2 +-
src/backend/executor/execExpr.c | 2 +-
src/backend/postmaster/bgworker.c | 2 +-
src/backend/replication/basebackup.c | 2 +-
src/include/lib/simplehash.h | 2 +-
11 files changed, 19 insertions(+), 19 deletions(-)