[docs] [issue27335] Clarify that writing to locals() inside a class body is supported

[Martin Panter]

Martin Panter added the comment:

I think my proposed patch for Issue 17546 addresses this. That patch was also written to address Issue 17960.

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nosy: +martin.panter

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue27335>
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