Update metrics_regression.rs

[era127]

fix spelling typo in comment

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (39b3eee) 36.69% compared to head (068c3ce) 36.68%.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #323      +/-   ##
==========================================
- Coverage   36.69%   36.68%   -0.02%     
==========================================
  Files          94       94              
  Lines        6240     6239       -1     
==========================================
- Hits         2290     2289       -1     
  Misses       3950     3950              

Files	Coverage Δ
src/metrics_regression.rs	27.72% <ø> (ø)

... and 2 files with indirect coverage changes

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[quietlychris]

If other maintainers feel differently, they're welcome to approve, but aside from taking "every little bit helps" at the most literal interpretation, I'm generally disinclined to accept single-letter PR's.

If you're interested in helping with the documentation and adding spelling/grammar corrections in other areas, I'd be happy to review a more substantial contribution, but otherwise I'll plan on closing this out after a bit.