Fix typo. in README.md

[agiron123]

Summary
Changing occured to occurred.

Test plan
No test plan needed.

[aaronabramov]

thank you!

[codecov-io]

Codecov Report

Merging #3635 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #3635   +/-   ##
=======================================
  Coverage   62.46%   62.46%           
=======================================
  Files         181      181           
  Lines        6652     6652           
  Branches        6        6           
=======================================
  Hits         4155     4155           
  Misses       2494     2494           
  Partials        3        3

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[github-actions]

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