Fix typo in React package README

[keller-mark]

This PR fixes a typo (count variable does not exist) and updates to use the new render export mechanism.

[changeset-bot]

⚠️ No Changeset found

Latest commit: 7240b03

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.36%. Comparing base (12ca2f8) to head (7240b03).
Report is 98 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #539      +/-   ##
==========================================
- Coverage   98.45%   97.36%   -1.09%     
==========================================
  Files           8        8              
  Lines         452      494      +42     
==========================================
+ Hits          445      481      +36     
- Misses          7       13       +6     

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[manzt]

Thanks!