fix typo and phrasing

[jonahwilliams]

Fix typo and improve comma budget on UUID doc comment. Also adds space after [UUid.parse] : which seems to be required to get VSCode jump to definition to work on that particular sentence

[codecov-commenter]

Codecov Report

Merging #1 (90aef40) into main (0251b2c) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main       #1   +/-   ##
=======================================
  Coverage   94.00%   94.00%           
=======================================
  Files           1        1           
  Lines         100      100           
=======================================
  Hits           94       94           
  Misses          6        6           

Impacted Files	Coverage Δ
lib/neouuid.dart	94.00% <ø> (ø)

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