[2.0.x] Updated various links in docs to use HTTPS.

Backport of 7c81b28ebc from master

docs/ref/contrib/gis/feeds.txt

@@ -11,7 +11,7 @@ in RSS/Atom feeds formatted according to either the `Simple GeoRSS`__ or
 Django's, please consult :doc:`Django's syndication documentation
 </ref/contrib/syndication>` for details on general usage.
 
-.. _W3C Geo: http://www.w3.org/2003/01/geo/
+.. _W3C Geo: https://www.w3.org/2003/01/geo/
 
 __ http://georss.org/simple.html
 

docs/ref/contrib/gis/forms-api.txt

@@ -9,7 +9,7 @@ GeoDjango provides some specialized form fields and widgets in order to visually
 display and edit geolocalized data on a map. By default, they use
 `OpenLayers`_-powered maps, with a base WMS layer provided by `NASA`_.
 
-.. _OpenLayers: http://openlayers.org/
+.. _OpenLayers: https://openlayers.org/
 .. _NASA: https://earthdata.nasa.gov/
 
 Field arguments

docs/ref/contrib/gis/functions.txt

@@ -171,7 +171,7 @@ Keyword Argument       Description
                        representation -- the default value is 8.
 =====================  =====================================================
 
-__ http://www.w3.org/Graphics/SVG/
+__ https://www.w3.org/Graphics/SVG/
 
 ``Azimuth``
 ===========

docs/ref/contrib/gis/geoip2.txt

@@ -19,7 +19,7 @@ that ``geoip2`` can leverage the C library's faster speed.
 
 __ https://geoip2.readthedocs.io/
 __ https://pypi.python.org/pypi/geoip2
-__ http://dev.maxmind.com/geoip/geoip2/geolite2/
+__ https://dev.maxmind.com/geoip/geoip2/geolite2/
 __ https://github.com/maxmind/libmaxminddb
 
 Example

docs/ref/contrib/gis/geoquerysets.txt

@@ -864,4 +864,4 @@ Example::
 .. rubric:: Footnotes
 .. [#fnde9im] *See* `OpenGIS Simple Feature Specification For SQL <http://www.opengis.org/docs/99-049.pdf>`_, at Ch. 2.1.13.2, p. 2-13 (The Dimensionally Extended Nine-Intersection Model).
 .. [#fnsdorelate] *See* `SDO_RELATE documentation <https://docs.oracle.com/database/121/SPATL/sdo_relate.htm#SPATL1039>`_, from the Oracle Spatial and Graph Developer's Guide.
-.. [#fncovers] For an explanation of this routine, read `Quirks of the "Contains" Spatial Predicate <http://lin-ear-th-inking.blogspot.com/2007/06/subtleties-of-ogc-covers-spatial.html>`_ by Martin Davis (a PostGIS developer).
+.. [#fncovers] For an explanation of this routine, read `Quirks of the "Contains" Spatial Predicate <https://lin-ear-th-inking.blogspot.com/2007/06/subtleties-of-ogc-covers-spatial.html>`_ by Martin Davis (a PostGIS developer).

docs/ref/contrib/gis/install/index.txt

@@ -225,7 +225,7 @@ __ https://www.python.org/ftp/python/
 Postgres.app
 ~~~~~~~~~~~~
 
-`Postgres.app <http://postgresapp.com/>`_ is a standalone PostgreSQL server
+`Postgres.app <https://postgresapp.com/>`_ is a standalone PostgreSQL server
 that includes the PostGIS extension. You will also need to install ``gdal`` and
 ``libgeoip`` with :ref:`homebrew`.
 
@@ -299,8 +299,8 @@ your ``.profile`` to be able to run the package programs from the command-line::
     export PATH=/Library/Frameworks/GDAL.framework/Programs:$PATH
     export PATH=/usr/local/pgsql/bin:$PATH
 
-__ http://www.kyngchaos.com/software/frameworks
-__ http://www.kyngchaos.com/software/postgres
+__ https://www.kyngchaos.com/software/frameworks
+__ https://www.kyngchaos.com/software/postgres
 
 .. _psycopg2_kyngchaos:
 

docs/ref/contrib/gis/tutorial.txt

@@ -745,7 +745,7 @@ you just created. Browse to any of the ``WorldBorder`` entries -- the borders
 may be edited by clicking on a polygon and dragging the vertexes to the desired
 position.
 
-.. _OpenLayers: http://openlayers.org/
+.. _OpenLayers: https://openlayers.org/
 .. _Open Street Map: https://www.openstreetmap.org/
 .. _Vector Map Level 0: http://earth-info.nga.mil/publications/vmap0.html
 .. _OSGeo: http://www.osgeo.org