[1.8.x] Updated Wikipedia links to use https

Backport of 64982cc2fb from master.

docs/ref/contrib/gis/geoquerysets.txt

@@ -731,7 +731,7 @@ the distance from the `Tasmanian`__ city of Hobart to every other
     :ref:`supported_units`.
 
 __ https://github.com/django/django/blob/master/tests/gis_tests/distapp/models.py
-__ http://en.wikipedia.org/wiki/Tasmania
+__ https://en.wikipedia.org/wiki/Tasmania
 
 ``length``
 ~~~~~~~~~~
@@ -994,7 +994,7 @@ Keyword Argument       Description
                        of 2 or 3.  The default value is 2.
 =====================  =====================================================
 
-__ http://en.wikipedia.org/wiki/Geography_Markup_Language
+__ https://en.wikipedia.org/wiki/Geography_Markup_Language
 
 ``kml``
 ~~~~~~~

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

@@ -16,7 +16,7 @@ example::
         poly = models.PolygonField()
         objects = models.GeoManager()
 
-__ http://en.wikipedia.org/wiki/ZIP_code
+__ https://en.wikipedia.org/wiki/ZIP_code
 
 Geometry Field Types
 ====================
@@ -82,7 +82,7 @@ Sets the SRID [#fnogcsrid]_ (Spatial Reference System Identity) of the geometry
 the given value. Defaults to 4326 (also known as `WGS84`__, units are in degrees
 of longitude and latitude).
 
-__ http://en.wikipedia.org/wiki/WGS84
+__ https://en.wikipedia.org/wiki/WGS84
 
 .. _selecting-an-srid:
 
@@ -135,8 +135,8 @@ Additional Resources:
   data encountered will be in one of these coordinate systems rather than
   in a geographic coordinate system such as WGS84.
 
-__ http://en.wikipedia.org/wiki/Geodesy
-__ http://en.wikipedia.org/wiki/Great_circle
+__ https://en.wikipedia.org/wiki/Geodesy
+__ https://en.wikipedia.org/wiki/Great_circle
 __ http://www.spatialreference.org/ref/epsg/2796/
 __ http://spatialreference.org/
 __ http://web.archive.org/web/20080302095452/http://welcome.warnercnr.colostate.edu/class_info/nr502/lg3/datums_coordinates/spcs.html

docs/ref/contrib/gis/tutorial.txt

@@ -158,7 +158,7 @@ extensions:
   data stored in the shapefile.
 
 __ http://thematicmapping.org/downloads/TM_WORLD_BORDERS-0.3.zip
-__ http://en.wikipedia.org/wiki/Shapefile
+__ https://en.wikipedia.org/wiki/Shapefile
 
 Use ``ogrinfo`` to examine spatial data
 ---------------------------------------
@@ -259,7 +259,7 @@ longitude, latitude pairs in units of degrees.  To use a different
 coordinate system, set the SRID of the geometry field with the ``srid``
 argument. Use an integer representing the coordinate system's EPSG code.
 
-__ http://en.wikipedia.org/wiki/SRID
+__ https://en.wikipedia.org/wiki/SRID
 
 Run ``migrate``
 ---------------