Fix docstring of method radiusArc

[nopria]

No description provided.

[codecov]

Codecov Report

Merging #388 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #388   +/-   ##
=======================================
  Coverage   93.31%   93.31%           
=======================================
  Files          19       19           
  Lines        4847     4847           
  Branches      483      483           
=======================================
  Hits         4523     4523           
  Misses        210      210           
  Partials      114      114           

Impacted Files	Coverage Δ
cadquery/cq.py	87.41% <ø> (ø)

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[jmwright]

Thanks for the contribution @nopria