[3.12] pythongh-101100: Fix references to URLError and ``HTTPErro…

…r`` in ``howto/urllib2.rst`` (pythonGH-107966) (python#110086)

pythongh-101100: Fix references to ``URLError`` and ``HTTPError`` in ``howto/urllib2.rst`` (pythonGH-107966)
(cherry picked from commit bfd94ab)

Co-authored-by: Yuki K <drsuaimqjgar@gmail.com>
Co-authored-by: Hugo van Kemenade <hugovk@users.noreply.github.com>

Doc/howto/urllib2.rst

@@ -194,11 +194,11 @@ which comes after we have a look at what happens when things go wrong.
 Handling Exceptions
 ===================
 
-*urlopen* raises :exc:`URLError` when it cannot handle a response (though as
+*urlopen* raises :exc:`~urllib.error.URLError` when it cannot handle a response (though as
 usual with Python APIs, built-in exceptions such as :exc:`ValueError`,
 :exc:`TypeError` etc. may also be raised).
 
-:exc:`HTTPError` is the subclass of :exc:`URLError` raised in the specific case of
+:exc:`~urllib.error.HTTPError` is the subclass of :exc:`~urllib.error.URLError` raised in the specific case of
 HTTP URLs.
 
 The exception classes are exported from the :mod:`urllib.error` module.
@@ -229,12 +229,12 @@ the status code indicates that the server is unable to fulfil the request. The
 default handlers will handle some of these responses for you (for example, if
 the response is a "redirection" that requests the client fetch the document from
 a different URL, urllib will handle that for you). For those it can't handle,
-urlopen will raise an :exc:`HTTPError`. Typical errors include '404' (page not
+urlopen will raise an :exc:`~urllib.error.HTTPError`. Typical errors include '404' (page not
 found), '403' (request forbidden), and '401' (authentication required).
 
 See section 10 of :rfc:`2616` for a reference on all the HTTP error codes.
 
-The :exc:`HTTPError` instance raised will have an integer 'code' attribute, which
+The :exc:`~urllib.error.HTTPError` instance raised will have an integer 'code' attribute, which
 corresponds to the error sent by the server.
 
 Error Codes
@@ -317,7 +317,7 @@ dictionary is reproduced here for convenience ::
         }
 
 When an error is raised the server responds by returning an HTTP error code
-*and* an error page. You can use the :exc:`HTTPError` instance as a response on the
+*and* an error page. You can use the :exc:`~urllib.error.HTTPError` instance as a response on the
 page returned. This means that as well as the code attribute, it also has read,
 geturl, and info, methods as returned by the ``urllib.response`` module::
 
@@ -338,7 +338,7 @@ geturl, and info, methods as returned by the ``urllib.response`` module::
 Wrapping it Up
 --------------
 
-So if you want to be prepared for :exc:`HTTPError` *or* :exc:`URLError` there are two
+So if you want to be prepared for :exc:`~urllib.error.HTTPError` *or* :exc:`~urllib.error.URLError` there are two
 basic approaches. I prefer the second approach.
 
 Number 1
@@ -365,7 +365,7 @@ Number 1
 .. note::
 
     The ``except HTTPError`` *must* come first, otherwise ``except URLError``
-    will *also* catch an :exc:`HTTPError`.
+    will *also* catch an :exc:`~urllib.error.HTTPError`.
 
 Number 2
 ~~~~~~~~
@@ -391,7 +391,7 @@ Number 2
 info and geturl
 ===============
 
-The response returned by urlopen (or the :exc:`HTTPError` instance) has two
+The response returned by urlopen (or the :exc:`~urllib.error.HTTPError` instance) has two
 useful methods :meth:`info` and :meth:`geturl` and is defined in the module
 :mod:`urllib.response`..