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

Fix collection of typos and grammar mistakes in the tree, volume 2

This fixes some comments and documentation new as of Postgres 13, and is
a follow-up of the work done in dd0f37e.

Author: Justin Pryzby
Discussion: https://postgr.es/m/20200408165653.GF2228@telsasoft.com

Branch
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master

Details
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https://git.postgresql.org/pg/commitdiff/8128b0c152a67917535f50738ac26da4f984ddd9

Modified Files
--------------
doc/src/sgml/auto-explain.sgml             |  2 +-
doc/src/sgml/monitoring.sgml               |  8 ++++----
doc/src/sgml/perform.sgml                  |  2 +-
doc/src/sgml/ref/create_publication.sgml   |  2 +-
doc/src/sgml/ref/pg_verifybackup.sgml      |  2 +-
doc/src/sgml/ref/psql-ref.sgml             | 16 ++++++++--------
doc/src/sgml/ref/select.sgml               |  2 +-
src/backend/executor/nodeIncrementalSort.c | 22 +++++++++++-----------
src/backend/replication/logical/relation.c |  2 +-
src/backend/utils/sort/tuplesort.c         |  2 +-
src/include/utils/tuplesort.h              |  2 +-
11 files changed, 31 insertions(+), 31 deletions(-)