[4.2.x] Updated broken links in docs.

Backport of 93830abf7694e0f281931f10eeaa34993855e7dd from main

docs/howto/outputting-pdf.txt

@@ -14,7 +14,7 @@ For example, Django was used at kusports.com_ to generate customized,
 printer-friendly NCAA tournament brackets, as PDF files, for people
 participating in a March Madness contest.
 
-.. _ReportLab: https://www.reportlab.com/opensource/
+.. _ReportLab: https://docs.reportlab.com/
 .. _kusports.com: http://www2.kusports.com/
 
 Install ReportLab

docs/internals/contributing/writing-code/unit-tests.txt

@@ -292,7 +292,7 @@ dependencies:
 * :pypi:`pywatchman`
 * :pypi:`redis` 3.4+
 * :pypi:`setuptools`
-* :pypi:`memcached`, plus a `supported Python binding
+* :pypi:`python-memcached`, plus a `supported Python binding
   <https://memcached.org/>`_
 * `gettext <https://www.gnu.org/software/gettext/manual/gettext.html>`_
   (:ref:`gettext_on_windows`)

docs/ref/contrib/gis/feeds.txt

@@ -13,7 +13,7 @@ Django's, please consult :doc:`Django's syndication documentation
 
 .. _W3C Geo: https://www.w3.org/2003/01/geo/
 
-__ https://georss.org
+__ https://www.ogc.org/standard/georss/
 
 Example
 =======

docs/ref/models/fields.txt

@@ -279,7 +279,7 @@ Django provides an ``IntegerChoices`` class. For example::
         suit = models.IntegerField(choices=Suit.choices)
 
 It is also possible to make use of the `Enum Functional API
-<https://docs.python.org/3/library/enum.html#functional-api>`_ with the caveat
+<https://docs.python.org/3/howto/enum.html#functional-api>`_ with the caveat
 that labels are automatically generated as highlighted above:
 
 .. code-block:: pycon