Fixed typo in TutorialReactNative.md

[bganicky]

Summary
It fixes a tiny typo in Jest documentation.

Test plan
Simple look at the PR diff should suffice. It's a single letter. :)

[ghost]

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[codecov-io]

Current coverage is 90.17% (diff: 100%)

Merging #1735 into master will not change coverage

@@             master      #1735   diff @@
==========================================
  Files            31         31          
  Lines          1170       1170          
  Methods           0          0          
  Messages          0          0          
  Branches          0          0          
==========================================
  Hits           1055       1055          
  Misses          115        115          
  Partials          0          0          

Powered by Codecov. Last update 4247e28...f52066f

[cpojer]

thank you!

[github-actions]

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