Documentation updates ahead of 0.9.2 release

[bmcfee]

Reference Issue

Fixes #1498
Fixes #1512
Fixes #1483

What does this implement/fix? Explain your changes.

Various small issues in documentation.

Any other comments?

I'll leave this open and roll in the changelog for 0.9.2 to this PR.

[codecov]

Codecov Report

Merging #1513 (91cbe7d) into main (b553440) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main    #1513   +/-   ##
=======================================
  Coverage   98.77%   98.77%           
=======================================
  Files          32       32           
  Lines        4151     4151           
=======================================
  Hits         4100     4100           
  Misses         51       51           

Flag	Coverage Δ
unittests	98.77% <100.00%> (ø)

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Impacted Files	Coverage Δ
librosa/effects.py	100.00% <ø> (ø)
librosa/segment.py	97.51% <ø> (ø)
librosa/version.py	100.00% <100.00%> (ø)

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[bmcfee]

I think this is done and ready to merge. I'll schedule the release for Monday, 6/27.