Added statement to prevent getiter error (#164)

When using for loops, we faced the error `_getiter_` not defined. This is the workaround for resolving it.
zopefoundation · Jun 21, 2019 · 34b670e · 34b670e
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commit 34b670e
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diff --git a/docs/usage/basic_usage.rst b/docs/usage/basic_usage.rst
@@ -104,6 +104,7 @@ To use classes in Python 3
     ``__metaclass__`` must be set. Set it to ``type`` to use no custom metaclass.
 
 To use ``for`` statements and comprehensions
+    ``_getiter_`` must point to :func:`RestrictedPython.Eval.default_guarded_getiter` and
     ``_iter_unpack_sequence_`` must point to :func:`RestrictedPython.Guards.guarded_iter_unpack_sequence`.
 
 To use ``getattr``