[issue28097] IDLE: document all key bindings, add menu items for more.

[miss-islington]

Change by miss-islington <mariatta.wijaya+miss-islington at gmail.com>:


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pull_requests: +10636, 10637, 10638
stage: needs patch -> patch review

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue28097>
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