bpo-39417: Fix broken link to guide to building venvs (GH-18432)

(cherry picked from commit c4a65ed)

Co-authored-by: Ogi Moore <ognyan.moore@jacobs.ucsd.edu>

Doc/library/venv.rst

@@ -27,7 +27,7 @@ See :pep:`405` for more information about Python virtual environments.
 .. seealso::
 
    `Python Packaging User Guide: Creating and using virtual environments
-   <https://packaging.python.org/installing/#creating-virtual-environments>`__
+   <https://packaging.python.org/guides/installing-using-pip-and-virtual-environments/#creating-a-virtual-environment>`__
 
 
 Creating virtual environments