Clarify that automagic is only for line magics.

Cell magics should always be explicitly prefixed.

IPython/core/magic.py

@@ -260,8 +260,8 b' class MagicsManager(Configurable):'
     auto_magic = Bool
 
     _auto_status = [
-        'Automagic is OFF, % prefix IS needed for magic functions.',
-        'Automagic is ON, % prefix IS NOT needed for magic functions.']
+        'Automagic is OFF, % prefix IS needed for line magics.',
+        'Automagic is ON, % prefix IS NOT needed for line magics.']
 
     user_magics = Instance('IPython.core.magics.UserMagics')