Merge pull request #6870 from stsewd/update-docs-intersphinx-with-basic-auth

Update docs about intersphinx and basic auth support

doc/usage/extensions/intersphinx.rst

@@ -148,3 +148,13 @@ project. The following example prints the Intersphinx mapping of the Python 3
 documentation::
 
    $ python -msphinx.ext.intersphinx https://docs.python.org/3/objects.inv
+
+Using Intersphinx with inventory file under Basic Authorization
+---------------------------------------------------------------
+
+Intersphinx supports Basic Authorization like this::
+
+      intersphinx_mapping = {'python': ('https://user:password@docs.python.org/3',
+                                        None)}
+
+The user and password will be stripped from the URL when generating the links.