[issue45759] Improve error messages for non-matching `elif`/`else` statements

[theeshallnotknowethme]

Change by theeshallnotknowethme <nohackingofkrowten at gmail.com>:


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pull_requests: +27765
pull_request: https://github.com/python/cpython/pull/29513

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue45759>
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