Fixed some spelling mistakes

[endeavor85]

Issue #, if available:

Description of changes: Fixed two spelling mistakes in the documentation.

Description of how you validated changes:

Checklist:

• Write/update tests
• make pr passes
• Update documentation

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[codecov-io]

Codecov Report

Merging #834 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #834   +/-   ##
=======================================
  Coverage   94.32%   94.32%           
=======================================
  Files          67       67           
  Lines        2626     2626           
  Branches      464      464           
=======================================
  Hits         2477     2477           
  Misses         78       78           
  Partials       71       71

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[jlhood]

Thanks for the contribution!