Unicode fixes

[bmcfee]

Fixes #426. Very minor stuff here, just fixes to the points noted by @iansimon .

I've checked the doc build and it looks fine - i see no problems merging once this passes CI.

[Copilot]

Pull request overview

This PR fixes Python 3.12+ SyntaxWarnings caused by invalid escape sequences in docstrings across four files. The changes replace problematic escape sequences (like \*, \%, 2\pi) with either Unicode characters (π) or backtick-formatted inline code to address issue #426.

Changes:

• Replaced \*\*kwargs escape sequences with backtick-formatted inline code in docstrings
• Replaced :math:2\pi`` math directive with Unicode character 2π for "periodic" descriptions
• Replaced 25\% escape sequence with plain 25% in documentation

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 4 comments.

File	Description
mir_eval/util.py	Updated has_kwargs and filter_kwargs docstrings to use backticks instead of escaped asterisks
mir_eval/sonify.py	Replaced math directive with Unicode π character in two function docstrings
mir_eval/hierarchy.py	Updated evaluate function docstring to use backticks instead of escaped asterisks
mir_eval/beat.py	Fixed escaped percentage sign in module-level documentation

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[Copilot]

Pull request overview

Copilot reviewed 4 out of 4 changed files in this pull request and generated no new comments.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

Flag	Coverage Δ
unittests	85.66% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
mir_eval/beat.py	99.06% <ø> (ø)
mir_eval/hierarchy.py	100.00% <ø> (ø)
mir_eval/sonify.py	99.09% <ø> (ø)
mir_eval/util.py	98.01% <ø> (ø)

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[craffel]

Ok to merge?

[bmcfee]

Yessir!