Fixed #33842 -- Used :source: role for links to repo files on GitHub.

docs/topics/cache.txt

@@ -438,7 +438,7 @@ cache backend with Django, use the Python import path as the
 
 If you're building your own backend, you can use the standard cache backends
 as reference implementations. You'll find the code in the
-``django/core/cache/backends/`` directory of the Django source.
+:source:`django/core/cache/backends/` directory of the Django source.
 
 Note: Without a really compelling reason, such as a host that doesn't support
 them, you should stick to the cache backends included with Django. They've

docs/topics/http/sessions.txt

@@ -526,7 +526,7 @@ calls ``save()`` and loops until an unused ``session_key`` is generated.
 
 If you're using the ``django.contrib.sessions.backends.db`` backend, each
 session is a normal Django model. The ``Session`` model is defined in
-``django/contrib/sessions/models.py``. Because it's a normal model, you can
+:source:`django/contrib/sessions/models.py`. Because it's a normal model, you can
 access sessions using the normal Django database API::
 
     >>> from django.contrib.sessions.models import Session

docs/topics/i18n/translation.txt

@@ -2080,7 +2080,7 @@ translations for the same literal:
 #. Then, it looks for and uses if it exists a ``locale`` directory in each
    of the installed apps listed in :setting:`INSTALLED_APPS`.  The ones
    appearing first have higher precedence than the ones appearing later.
-#. Finally, the Django-provided base translation in ``django/conf/locale``
+#. Finally, the Django-provided base translation in :source:`django/conf/locale`
    is used as a fallback.
 
 .. seealso::

docs/topics/settings.txt

@@ -90,7 +90,7 @@ Default settings
 
 A Django settings file doesn't have to define any settings if it doesn't need
 to. Each setting has a sensible default value. These defaults live in the
-module :file:`django/conf/global_settings.py`.
+module :source:`django/conf/global_settings.py`.
 
 Here's the algorithm Django uses in compiling settings: