Fixed a small spelling mistake in the tutorial docs

[mikeengland]

No description provided.

[codecov]

Codecov Report

Merging #593 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #593   +/-   ##
=======================================
  Coverage   99.27%   99.27%           
=======================================
  Files          89       89           
  Lines       10651    10651           
  Branches      747      747           
=======================================
  Hits        10574    10574           
  Misses         59       59           
  Partials       18       18

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[njsmith]

Thanks, and welcome! 🎉 🎂 And, no pressure, but if you'd like to keep contributing then we'd love to have you, so I'm sending you a github invite now. You can read more about this in our contributing documentation.