Describe each contrib module in its SGML section title

The original titles only had the module name, which is not very useful
when scanning the list.  By adding a very brief description to each
title, the table of contents becomes friendlier.

Also amend the introduction in the "additional modules" appendix, using
the word "Extension" more extensively.  Nowadays, almost all contrib
modules are extensions, so this is also helpful.

Author: Karl O. Pinc <[email protected]>
Reviewed-by: Brar Piening <[email protected]>
Discussion: https://postgr.es/m/[email protected]

Branch
------
master

Details
-------
https://git.postgresql.org/pg/commitdiff/e86c8b728f3c905e5993211f6fd1d107d5a4614f

Modified Files
--------------
doc/src/sgml/adminpack.sgml           |  2 +-
doc/src/sgml/amcheck.sgml             |  2 +-
doc/src/sgml/auth-delay.sgml          |  2 +-
doc/src/sgml/auto-explain.sgml        |  2 +-
doc/src/sgml/basebackup-to-shell.sgml |  2 +-
doc/src/sgml/basic-archive.sgml       |  2 +-
doc/src/sgml/bloom.sgml               |  2 +-
doc/src/sgml/btree-gin.sgml           |  4 +--
doc/src/sgml/btree-gist.sgml          |  2 +-
doc/src/sgml/citext.sgml              |  2 +-
doc/src/sgml/contrib-spi.sgml         |  2 +-
doc/src/sgml/contrib.sgml             | 47 +++++++++++++++++++----------------
doc/src/sgml/cube.sgml                |  2 +-
doc/src/sgml/dblink.sgml              |  2 +-
doc/src/sgml/dict-int.sgml            |  3 ++-
doc/src/sgml/dict-xsyn.sgml           |  2 +-
doc/src/sgml/earthdistance.sgml       |  2 +-
doc/src/sgml/file-fdw.sgml            |  2 +-
doc/src/sgml/fuzzystrmatch.sgml       |  2 +-
doc/src/sgml/hstore.sgml              |  2 +-
doc/src/sgml/intagg.sgml              |  2 +-
doc/src/sgml/intarray.sgml            |  2 +-
doc/src/sgml/isn.sgml                 |  2 +-
doc/src/sgml/lo.sgml                  |  2 +-
doc/src/sgml/ltree.sgml               |  2 +-
doc/src/sgml/oldsnapshot.sgml         |  2 +-
doc/src/sgml/pageinspect.sgml         |  2 +-
doc/src/sgml/passwordcheck.sgml       |  2 +-
doc/src/sgml/pgbuffercache.sgml       |  2 +-
doc/src/sgml/pgcrypto.sgml            |  2 +-
doc/src/sgml/pgfreespacemap.sgml      |  2 +-
doc/src/sgml/pgprewarm.sgml           |  2 +-
doc/src/sgml/pgrowlocks.sgml          |  2 +-
doc/src/sgml/pgstatstatements.sgml    |  2 +-
doc/src/sgml/pgstattuple.sgml         |  2 +-
doc/src/sgml/pgsurgery.sgml           |  2 +-
doc/src/sgml/pgtrgm.sgml              |  3 ++-
doc/src/sgml/pgvisibility.sgml        |  2 +-
doc/src/sgml/pgwalinspect.sgml        |  2 +-
doc/src/sgml/postgres-fdw.sgml        |  3 ++-
doc/src/sgml/seg.sgml                 |  2 +-
doc/src/sgml/sepgsql.sgml             |  3 ++-
doc/src/sgml/sslinfo.sgml             |  2 +-
doc/src/sgml/tablefunc.sgml           |  2 +-
doc/src/sgml/tcn.sgml                 |  2 +-
doc/src/sgml/test-decoding.sgml       |  2 +-
doc/src/sgml/tsm-system-rows.sgml     |  3 ++-
doc/src/sgml/tsm-system-time.sgml     |  3 ++-
doc/src/sgml/unaccent.sgml            |  2 +-
doc/src/sgml/uuid-ossp.sgml           |  2 +-
doc/src/sgml/xml2.sgml                |  2 +-
51 files changed, 83 insertions(+), 72 deletions(-)

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