Fix parameter descriptions in gp_priors.py

[astrolamb]

Correcting "<" and ">" in description of parameters in broken_powerlaw()

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 72.59%. Comparing base (e04d9d4) to head (ebadc2f).
⚠️ Report is 56 commits behind head on dev.

Additional details and impacted files

@@            Coverage Diff             @@
##              dev     #443      +/-   ##
==========================================
+ Coverage   72.53%   72.59%   +0.06%     
==========================================
  Files          13       13              
  Lines        3401     3478      +77     
==========================================
+ Hits         2467     2525      +58     
- Misses        934      953      +19     

Files with missing lines	Coverage Δ
enterprise/signals/gp_priors.py	85.33% <100.00%> (+1.04%)	⬆️

... and 7 files with indirect coverage changes

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