docs: fix typo in COLLABORATOR_GUIDE

[gesinger]

Description

Fix a small typo in the COLLABORATOR_GUIDE

Requirements Checklist

• Feature implemented / Bug fixed
• If necessary, more likely in a feature request than a bug fix
  • Change has been verified in an actual browser (Chrome, Firefox, IE)
  • Unit Tests updated or fixed
  • Docs/guides updated
  • Example created (starter template on JSBin)
• Reviewed by Two Core Contributors

[codecov]

Codecov Report

Merging #7537 (246886c) into main (76985c6) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #7537   +/-   ##
=======================================
  Coverage   80.26%   80.26%           
=======================================
  Files         116      116           
  Lines        7321     7321           
  Branches     1769     1769           
=======================================
  Hits         5876     5876           
  Misses       1445     1445           

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