Fix some typos

[ydah]

This PR is fix some typos.

[codecov]

Codecov Report

All modified lines are covered by tests ✅

Comparison is base (76ea712) 90.08% compared to head (7a2ba50) 90.08%.

❗ Current head 7a2ba50 differs from pull request most recent head 466a97d. Consider uploading reports for the commit 466a97d to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #505   +/-   ##
=======================================
  Coverage   90.08%   90.08%           
=======================================
  Files          76       76           
  Lines        1584     1584           
=======================================
  Hits         1427     1427           
  Misses        157      157           

Files	Coverage Δ
lib/json-schema/util/uuid.rb	47.40% <ø> (ø)

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