pgsql: doc: Refresh more URLs in the docs - Mailing list pgsql-committers

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outdated.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
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REL9_5_STABLE

Details
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https://git.postgresql.org/pg/commitdiff/045d03fcaf208d45d509f0b0e6613c523d03cd2b

Modified Files
--------------
doc/src/sgml/acronyms.sgml          |  4 ++--
doc/src/sgml/biblio.sgml            | 23 ++++++++++-------------
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               |  8 ++++----
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, 39 insertions(+), 42 deletions(-)