Updated broken links in docs/ref/contrib/gis/tutorial.txt.

docs/ref/contrib/gis/tutorial.txt

@@ -37,7 +37,7 @@ basic apps`_ project. [#]_
     instructions.
 
 .. _OGC: https://www.ogc.org/
-.. _world borders: https://thematicmapping.org/downloads/world_borders.php
+.. _world borders: https://web.archive.org/web/20240123190237/https://thematicmapping.org/downloads/world_borders.php
 .. _GeoDjango basic apps: https://code.google.com/archive/p/geodjango-basic-apps
 
 Setting Up
@@ -115,7 +115,7 @@ unzip. On GNU/Linux platforms, use the following commands:
 
     $ mkdir world/data
     $ cd world/data
-    $ wget https://thematicmapping.org/downloads/TM_WORLD_BORDERS-0.3.zip
+    $ wget https://web.archive.org/web/20231220150759/https://thematicmapping.org/downloads/TM_WORLD_BORDERS-0.3.zip
     $ unzip TM_WORLD_BORDERS-0.3.zip
     $ cd ../..
 
@@ -131,7 +131,7 @@ extensions:
 * ``.prj``: Contains the spatial reference information for the geographic
   data stored in the shapefile.
 
-__ https://thematicmapping.org/downloads/TM_WORLD_BORDERS-0.3.zip
+__ https://web.archive.org/web/20231220150759/https://thematicmapping.org/downloads/TM_WORLD_BORDERS-0.3.zip
 __ https://en.wikipedia.org/wiki/Shapefile
 
 Use ``ogrinfo`` to examine spatial data
@@ -807,9 +807,8 @@ in your ``admin.py`` file::
 
 .. rubric:: Footnotes
 
-.. [#] Special thanks to Bjørn Sandvik of `thematicmapping.org
-       <https://thematicmapping.org/>`_ for providing and maintaining this
-       dataset.
+.. [#] Special thanks to Bjørn Sandvik of `mastermaps.net
+       <https://mastermaps.net/>`_ for providing and maintaining this dataset.
 .. [#] GeoDjango basic apps was written by Dane Springmeyer, Josh Livni, and
        Christopher Schmidt.
 .. [#] This point is the `University of Houston Law Center