[3.11] Docs: fix broken links (GH-116651) (#116701)

(cherry picked from commit 3f1b6efee9)

Doc/faq/extending.rst

@@ -50,7 +50,7 @@ to learn Python's C API.
 If you need to interface to some C or C++ library for which no Python extension
 currently exists, you can try wrapping the library's data types and functions
 with a tool such as `SWIG <https://www.swig.org>`_.  `SIP
-<https://riverbankcomputing.com/software/sip/intro>`__, `CXX
+<https://github.com/Python-SIP/sip>`__, `CXX
 <https://cxx.sourceforge.net/>`_ `Boost
 <https://www.boost.org/libs/python/doc/index.html>`_, or `Weave
 <https://github.com/scipy/weave>`_ are also

Doc/library/math.rst

@@ -578,7 +578,7 @@ Special functions
 
    The :func:`erf` function can be used to compute traditional statistical
    functions such as the `cumulative standard normal distribution
-   <https://en.wikipedia.org/wiki/Normal_distribution#Cumulative_distribution_functions>`_::
+   <https://en.wikipedia.org/wiki/Cumulative_distribution_function>`_::
 
      def phi(x):
          'Cumulative distribution function for the standard normal distribution'

Doc/library/venv.rst

@@ -54,7 +54,7 @@ See :pep:`405` for more background on Python virtual environments.
 .. seealso::
 
    `Python Packaging User Guide: Creating and using virtual environments
-   <https://packaging.python.org/guides/installing-using-pip-and-virtual-environments/#creating-a-virtual-environment>`__
+   <https://packaging.python.org/guides/installing-using-pip-and-virtual-environments/#create-and-use-virtual-environments>`__
 
 .. include:: ../includes/wasm-notavail.rst