Refs #23919 -- Replaced doc references to django.utils.http.urlquote() and urlquote_plus() with standard library alternatives.

Follow up to fee42fd99ee470528858c2ccb3621135c30ec262.

docs/ref/unicode.txt

@@ -150,19 +150,16 @@ Web frameworks have to deal with URLs (which are a type of IRI_). One
 requirement of URLs is that they are encoded using only ASCII characters.
 However, in an international environment, you might need to construct a
 URL from an IRI_ -- very loosely speaking, a URI_ that can contain Unicode
-characters. Quoting and converting an IRI to URI can be a little tricky, so
-Django provides some assistance.
+characters. Use these functions for quoting and converting an IRI to a URI:
 
-* The function :func:`django.utils.encoding.iri_to_uri()` implements the
-  conversion from IRI to URI as required by the specification (:rfc:`3987#section-3.1`).
+* The :func:`django.utils.encoding.iri_to_uri()` function, which implements the
+  conversion from IRI to URI as required by :rfc:`3987#section-3.1`.
 
-* The functions ``django.utils.http.urlquote()`` and
-  ``django.utils.http.urlquote_plus()`` are versions of Python's standard
-  ``urllib.quote()`` and ``urllib.quote_plus()`` that work with non-ASCII
-  characters. (The data is converted to UTF-8 prior to encoding.)
+* The :func:`urllib.parse.quote` and :func:`urllib.parse.quote_plus`
+  functions from Python's standard library.
 
 These two groups of functions have slightly different purposes, and it's
-important to keep them straight. Normally, you would use ``urlquote()`` on the
+important to keep them straight. Normally, you would use ``quote()`` on the
 individual portions of the IRI or URI path so that any reserved characters
 such as '&' or '%' are correctly encoded. Then, you apply ``iri_to_uri()`` to
 the full IRI and it converts any non-ASCII characters to the correct encoded
@@ -181,13 +178,15 @@ like that.
 
 An example might clarify things here::
 
-    >>> urlquote('Paris & Orléans')
+    >>> from urllib.parse import quote
+    >>> from django.utils.encoding import iri_to_uri
+    >>> quote('Paris & Orléans')
     'Paris%20%26%20Orl%C3%A9ans'
-    >>> iri_to_uri('/favorites/François/%s' % urlquote('Paris & Orléans'))
+    >>> iri_to_uri('/favorites/François/%s' % quote('Paris & Orléans'))
     '/favorites/Fran%C3%A7ois/Paris%20%26%20Orl%C3%A9ans'
 
 If you look carefully, you can see that the portion that was generated by
-``urlquote()`` in the second example was not double-quoted when passed to
+``quote()`` in the second example was not double-quoted when passed to
 ``iri_to_uri()``. This is a very important and useful feature. It means that
 you can construct your IRI without worrying about whether it contains
 non-ASCII characters and then, right at the end, call ``iri_to_uri()`` on the
@@ -198,6 +197,7 @@ implements the conversion from URI to IRI as per :rfc:`3987#section-3.2`.
 
 An example to demonstrate::
 
+    >>> from django.utils.encoding import uri_to_iri
     >>> uri_to_iri('/%E2%99%A5%E2%99%A5/?utf8=%E2%9C%93')
     '/♥♥/?utf8=✓'
     >>> uri_to_iri('%A9hello%3Fworld')
@@ -240,14 +240,14 @@ handles this for you automatically.
 
 If you're constructing a URL manually (i.e., *not* using the ``reverse()``
 function), you'll need to take care of the encoding yourself. In this case,
-use the ``iri_to_uri()`` and ``urlquote()`` functions that were documented
+use the ``iri_to_uri()`` and ``quote()`` functions that were documented
 above_. For example::
 
+    from urllib.parse import quote
     from django.utils.encoding import iri_to_uri
-    from django.utils.http import urlquote
 
     def get_absolute_url(self):
-        url = '/person/%s/?x=0&y=0' % urlquote(self.location)
+        url = '/person/%s/?x=0&y=0' % quote(self.location)
         return iri_to_uri(url)
 
 This function returns a correctly encoded URL even if ``self.location`` is