Fix PHPDoc typings

[ricardogobbosouza]

Resolve #120

[codecov]

Codecov Report

Merging #121 (9059f7f) into main (93aa13d) will not change coverage.
The diff coverage is n/a.

@@             Coverage Diff             @@
##                main      #121   +/-   ##
===========================================
  Coverage     100.00%   100.00%           
  Complexity       155       155           
===========================================
  Files             16        16           
  Lines            349       349           
===========================================
  Hits             349       349           

Impacted Files	Coverage Δ
src/Money.php	100.00% <ø> (ø)
src/MoneyFactory.php	100.00% <ø> (ø)

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