[issue25564] Document that IDLE -python difference for `del __builtins__`

[Roundup Robot]

Roundup Robot added the comment:

New changeset 862761e4376e by Terry Jan Reedy in branch '2.7':
Issue #25564: Mention exec and __builtins__ in IDLE-console difference section.
https://hg.python.org/cpython/rev/862761e4376e

New changeset 641852513b8e by Terry Jan Reedy in branch '3.5':
Issue #25564: Mention exec and __builtins__ in IDLE-console difference section.
https://hg.python.org/cpython/rev/641852513b8e

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nosy: +python-dev

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