pgsql: doc: Refresh more URLs in the docs

doc: Refresh more URLs in the docs

This updates some URLs that are redirections, mostly to an equivalent
using https. One URL referring to generalized partial indexes was
outdated.

Author: Kyotaro Horiguchi
Discussion: /messages/by-id/20200717.121308.1369606287593685396.horikyota.ntt@gmail.com
Backpatch-through: 9.5

Branch
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REL_13_STABLE

Details
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https://git.postgresql.org/pg/commitdiff/f2b65519e17d6de4cd95dfe1570ab1aca187b24d

Modified Files
--------------
doc/src/sgml/acronyms.sgml | 6 +++---
doc/src/sgml/biblio.sgml | 22 +++++++++++-----------
doc/src/sgml/config.sgml | 2 +-
doc/src/sgml/cube.sgml | 2 +-
doc/src/sgml/dfunc.sgml | 2 +-
doc/src/sgml/earthdistance.sgml | 2 +-
doc/src/sgml/external-projects.sgml | 10 +++++-----
doc/src/sgml/geqo.sgml | 2 +-
doc/src/sgml/install-windows.sgml | 6 +++---
doc/src/sgml/intro.sgml | 2 +-
doc/src/sgml/isn.sgml | 2 +-
doc/src/sgml/monitoring.sgml | 2 +-
doc/src/sgml/nls.sgml | 2 +-
doc/src/sgml/pgcrypto.sgml | 6 +++---
doc/src/sgml/plperl.sgml | 2 +-
doc/src/sgml/pltcl.sgml | 2 +-
doc/src/sgml/seg.sgml | 2 +-
doc/src/sgml/textsearch.sgml | 2 +-
18 files changed, 38 insertions(+), 38 deletions(-)