FIx typo: PlainDateTime => Duration

[justingrant]

Fixes a typo in the docs for Duration.p.round()

[codecov]

Codecov Report

Merging #1512 (f8387d3) into main (2c44028) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #1512   +/-   ##
=======================================
  Coverage   95.58%   95.58%           
=======================================
  Files          19       19           
  Lines       11139    11139           
  Branches     1736     1736           
=======================================
  Hits        10647    10647           
  Misses        486      486           
  Partials        6        6           

Flag	Coverage Δ
test262	61.02% <ø> (ø)
tests	91.76% <ø> (ø)

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[ptomato]

👍