Fix #985: Update "acknowledging events" code snippet

[zimeg]

Summary

This PR updates the code snippet in the "acknowledging events" document to use modals instead of dialogs (as dialogs are outmoded). Closes #985.

Requirements

• I've read and understood the Contributing Guidelines and have done my best effort to follow them.
• I've read and agree to the Code of Conduct.

[codecov]

Codecov Report

Merging #997 (9f5ff33) into main (7d04f5d) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #997   +/-   ##
=======================================
  Coverage   66.41%   66.41%           
=======================================
  Files          13       13           
  Lines        1212     1212           
  Branches      357      357           
=======================================
  Hits          805      805           
  Misses        338      338           
  Partials       69       69           

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[seratch]

Thanks for fixing this! Looks good to me 👍 The maintainers can do "Squash and merge" once the CI builds pass.