PYTHON-5205 Replace http with https in doc links

- No secure link for flask.pocoo.org

Author: aclark4life

doc/faq.rst

@@ -445,7 +445,7 @@ in Flask_ (other web frameworks are similar)::
   if __name__ == "__main__":
       app.run()
 
-.. _Flask: https://flask.pocoo.org/
+.. _Flask: http://flask.pocoo.org/
 
 .. seealso:: :ref:`querying-by-objectid`