merge from 3.5

Issue26135 - In the tutorial section on modules, reference importlib.reload instead of imp.reload.

Author: orsenthil

Doc/tutorial/modules.rst

@@ -117,7 +117,8 @@ use it to save typing in interactive sessions.
    For efficiency reasons, each module is only imported once per interpreter
    session.  Therefore, if you change your modules, you must restart the
    interpreter -- or, if it's just one module you want to test interactively,
-   use :func:`imp.reload`, e.g. ``import imp; imp.reload(modulename)``.
+   use :func:`importlib.reload`, e.g. ``import importlib;
+   importlib.reload(modulename)``.
 
 
 .. _tut-modulesasscripts: