Fix comprehension semantics for tuple example

[huangsam]

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Describe the change
Fixes #210

Additional context
A genuinely constructive feedback about something I glossed over while writing that module.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.55%. Comparing base (ce3e119) to head (9d41e54).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #211   +/-   ##
=======================================
  Coverage   99.55%   99.55%           
=======================================
  Files          43       43           
  Lines        1778     1778           
  Branches      113      113           
=======================================
  Hits         1770     1770           
  Misses          4        4           
  Partials        4        4           

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