Update Working with Modals.md

[courtneybeisner]

Proofread and made changes.

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If Applicable:

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If Public API Has Changed:

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[codecov-commenter]

Codecov Report

Merging #141 (5a1e348) into main (4238248) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #141   +/-   ##
=======================================
  Coverage   91.36%   91.36%           
=======================================
  Files          81       81           
  Lines        2096     2096           
=======================================
  Hits         1915     1915           
  Misses        181      181           

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