Fix small bugs from issue 183

[CosmoMatt]

This addresses the bugs outlined in issue #183 kindly provided by @PhilippMisofCH

• dl array corrected to float64 in rotation function.
• explicitly cast spin to absolute value to avoid negative power warnings in JAX in various places
• change Risbo arg check function to raw string literal (r"""...) to allow LaTeX equation.

[CosmoMatt]

@PhilippMisofCH so long as it's ok with you, I can add you as a contributor for debugging. No worries if not.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.77%. Comparing base (5ccf24b) to head (16f0efc).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #189   +/-   ##
=======================================
  Coverage   91.77%   91.77%           
=======================================
  Files          24       24           
  Lines        2601     2601           
=======================================
  Hits         2387     2387           
  Misses        214      214           

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[PhilippMisofCH]

Sure! I will continue using this library for some time and I'm happy to help with small bugs.

[CosmoMatt]

@all-contributors please add @PhilippMisofCH for bug

[allcontributors]

@CosmoMatt

I've put up a pull request to add @PhilippMisofCH! 🎉

[jasonmcewen]

Thanks for flagging this @PhilippMisofCH ! And thanks for addressing so quickly @CosmoMatt ! Have jsut reviewed and approved.

[CosmoMatt]

closes #183