docs(path): re-add URL examples to @std/path/posix examples

[devmattrick]

I'm not sure if this was intentional, but the documentation added regarding URL manipulation with the @std/path/posix module in #5371 was inadvertently removed in #5900 and #5904.

It seems like the methods that accept a URL object are still in unstable and the current docs for @std/url link to the @std/path/posix module, so I think it might be a good idea to re-add these examples.

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.56%. Comparing base (a4cd8af) to head (4d71bb0).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #6105   +/-   ##
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  Coverage   96.55%   96.56%           
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  Files         534      534           
  Lines       40589    40589           
  Branches     6093     6093           
=======================================
+ Hits        39190    39194    +4     
+ Misses       1355     1351    -4     
  Partials       44       44           

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[kt3k]

Sounds reasonable to me. Thanks for the suggestion.