fix misc docs issues

[conradoplg]

Closes #448

Also fixes two current doc warnings

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: -0.02% ⚠️

Comparison is base (60d9942) 77.46% compared to head (685a90d) 77.44%.
Report is 9 commits behind head on main.

❗ Current head 685a90d differs from pull request most recent head 62574aa. Consider uploading reports for the commit 62574aa to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #489      +/-   ##
==========================================
- Coverage   77.46%   77.44%   -0.02%     
==========================================
  Files          30       30              
  Lines        2738     2736       -2     
==========================================
- Hits         2121     2119       -2     
  Misses        617      617              

Files Changed	Coverage Δ
frost-core/src/frost.rs	91.63% <ø> (-0.07%)	⬇️
frost-core/src/frost/round1.rs	89.10% <ø> (ø)
frost-rerandomized/src/lib.rs	88.88% <ø> (ø)

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