Change CQContext docs indentation

[RubenRubens]

It's not not a big deal.

[codecov]

Codecov Report

Merging #571 (b78fa2c) into master (f4b5e82) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #571   +/-   ##
=======================================
  Coverage   94.26%   94.26%           
=======================================
  Files          29       29           
  Lines        6348     6348           
  Branches      675      675           
=======================================
  Hits         5984     5984           
  Misses        226      226           
  Partials      138      138           

Impacted Files	Coverage Δ
cadquery/cq.py	89.65% <ø> (ø)

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[jmwright]

Thanks @RubenRubens