[issue25467] Put “deprecated” warnings first

[Ezio Melotti]

Ezio Melotti added the comment:

I would rather avoid a JS-based solution.

It should be possible to create a mixin that adds the checks for deprecated/versionadded directives among the children of the node, and then define new directives for functions/methods/classes that inherit from the existing one and the mixin.
These directives can be added to https://hg.python.org/cpython/file/tip/Doc/tools/extensions/pyspecific.py

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