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outdated.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: https://postgr.es/m/20200717.121308.1369606287593685396.horikyota.ntt@gmail.com
Backpatch-through: 9.5

Branch
------
REL_12_STABLE

Details
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https://git.postgresql.org/pg/commitdiff/ab5ad0c71a0f4428d6ecb874b7eaa7a95fe4c17e

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(-)