[docs] [issue35563] Doc: warnings.rst - add links to references

[Cheryl Sabella]

Cheryl Sabella <cheryl.sabella at gmail.com> added the comment:

@xtreak, maybe it's related to the maintenance Ernest did yesterday on the bugs.python.org server?  Not sure the best way to ping him.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue35563>
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