[4.2.x] Refs #34140 -- Applied rst code-block to non-Python examples.

Thanks to J.V. Zammit, Paolo Melchiorre, and Mariusz Felisiak for
reviews.

Backport of 534ac48297 from main.

docs/ref/unicode.txt

@@ -174,7 +174,9 @@ further encoded when passed to ``iri_to_uri()``. This means you can pass a
 full URL to this function and it will not mess up the query string or anything
 like that.
 
-An example might clarify things here::
+An example might clarify things here:
+
+.. code-block:: pycon
 
     >>> from urllib.parse import quote
     >>> from django.utils.encoding import iri_to_uri
@@ -193,7 +195,9 @@ result.
 Similarly, Django provides :func:`django.utils.encoding.uri_to_iri()` which
 implements the conversion from URI to IRI as per :rfc:`3987#section-3.2`.
 
-An example to demonstrate::
+An example to demonstrate:
+
+.. code-block:: pycon
 
     >>> from django.utils.encoding import uri_to_iri
     >>> uri_to_iri('/%E2%99%A5%E2%99%A5/?utf8=%E2%9C%93')
@@ -309,7 +313,9 @@ and application server for the appropriate syntax and location to set this
 variable. See the :doc:`/howto/deployment/wsgi/modwsgi` for examples.
 
 In your development environment, you might need to add a setting to your
-``~.bashrc`` analogous to:::
+``~.bashrc`` analogous to:
+
+.. code-block:: shell
 
     export LANG="en_US.UTF-8"