fixes to reference.md

[eileenruberto]

Fixed typos in exact_perfect_match.

<--------------------- REMOVE THE LINES BELOW BEFORE MERGING --------------------->

Checklist

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• I have ensured that the pull request is of a manageable size, allowing it to be reviewed within a single session.
• I have reviewed my changes to ensure they are clear, concise, and well-documented.
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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.17%. Comparing base (f0944e3) to head (1103830).
Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #120   +/-   ##
=======================================
  Coverage   95.17%   95.17%           
=======================================
  Files          26       26           
  Lines        1284     1284           
=======================================
  Hits         1222     1222           
  Misses         62       62           

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[ericbuckley]

@eileenruberto I know we did this mostly as an exercise in process, but did you come across any other typos or wording changes that you'd like to make to the site docs?