Fix incorrect type in comment for 'when'

[pfw]

No description provided.

[hugovk]

Thank you!

[codecov-commenter]

Codecov Report

Merging #222 (927704b) into master (441fa84) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #222   +/-   ##
=======================================
  Coverage   99.68%   99.68%           
=======================================
  Files           9        9           
  Lines         632      632           
=======================================
  Hits          630      630           
  Misses          2        2           

Flag	Coverage Δ
GHA_Ubuntu	98.41% <ø> (ø)
GHA_Windows	98.10% <ø> (ø)
GHA_macOS	98.41% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/humanize/time.py	100.00% <ø> (ø)

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