docs(path): Fix doc lints in `@std/path` to prepare for stabilization

[nathanwhit]

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 80.00000% with 3 lines in your changes are missing coverage. Please review.

Project coverage is 91.96%. Comparing base (0079ea0) to head (6836e77). Report is 4 commits behind head on main.

Files	Patch %	Lines
path/constants.ts	50.00%	3 Missing :warning:

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4839      +/-   ##
==========================================
- Coverage   91.97%   91.96%   -0.01%     
==========================================
  Files         486      487       +1     
  Lines       41461    41550      +89     
  Branches     5360     5365       +5     
==========================================
+ Hits        38133    38213      +80     
- Misses       3270     3279       +9     
  Partials       58       58              

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[kt3k]

I'll continue this work in #4900. Thanks @nathanwhit for the contribution!