pgsql: doc: add commas after 'i.e.' and 'e.g.'

doc: add commas after 'i.e.' and 'e.g.'

This follows the American format,
https://jakubmarian.com/comma-after-i-e-and-e-g/. There is no intention
of requiring this format for future text, but making existing text
consistent every few years makes sense.

Discussion: https://postgr.es/m/20200825183619.GA22369@momjian.us

Backpatch-through: 9.5

Branch
------
REL9_5_STABLE

Details
-------
https://git.postgresql.org/pg/commitdiff/2dbe3ea7a85473ff4b32eebf1508e1c604d8b7da

Modified Files
--------------
doc/src/sgml/config.sgml | 12 ++++++------
doc/src/sgml/cube.sgml | 4 ++--
doc/src/sgml/datatype.sgml | 2 +-
doc/src/sgml/ddl.sgml | 2 +-
doc/src/sgml/docguide.sgml | 8 ++++----
doc/src/sgml/ecpg.sgml | 6 +++---
doc/src/sgml/extend.sgml | 2 +-
doc/src/sgml/func.sgml | 12 ++++++------
doc/src/sgml/gin.sgml | 2 +-
doc/src/sgml/high-availability.sgml | 8 ++++----
doc/src/sgml/indexam.sgml | 2 +-
doc/src/sgml/install-windows.sgml | 4 ++--
doc/src/sgml/libpq.sgml | 6 +++---
doc/src/sgml/monitoring.sgml | 2 +-
doc/src/sgml/mvcc.sgml | 2 +-
doc/src/sgml/perform.sgml | 2 +-
doc/src/sgml/protocol.sgml | 8 ++++----
doc/src/sgml/queries.sgml | 4 ++--
doc/src/sgml/recovery-config.sgml | 2 +-
doc/src/sgml/ref/create_database.sgml | 4 ++--
doc/src/sgml/ref/create_event_trigger.sgml | 2 +-
doc/src/sgml/ref/create_function.sgml | 2 +-
doc/src/sgml/ref/grant.sgml | 2 +-
doc/src/sgml/ref/initdb.sgml | 2 +-
doc/src/sgml/ref/pg_dump.sgml | 2 +-
doc/src/sgml/ref/pg_dumpall.sgml | 2 +-
doc/src/sgml/ref/pg_restore.sgml | 2 +-
doc/src/sgml/ref/pgbench.sgml | 8 ++++----
doc/src/sgml/ref/pgupgrade.sgml | 24 ++++++++++++------------
doc/src/sgml/ref/postgres-ref.sgml | 2 +-
doc/src/sgml/ref/psql-ref.sgml | 6 +++---
doc/src/sgml/release-9.5.sgml | 6 +++---
doc/src/sgml/replication-origins.sgml | 6 +++---
doc/src/sgml/runtime.sgml | 2 +-
doc/src/sgml/sepgsql.sgml | 2 +-
doc/src/sgml/sslinfo.sgml | 4 ++--
doc/src/sgml/wal.sgml | 2 +-
doc/src/sgml/xfunc.sgml | 6 +++---
doc/src/sgml/xml2.sgml | 2 +-
39 files changed, 89 insertions(+), 89 deletions(-)