[Issue 18294] std.path.dirName needs better documentation

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=18294

berni44 <bugzilla at d-ecke.de> changed:

           What    |Removed                     |Added
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             Status|NEW                         |RESOLVED
                 CC|                            |bugzilla at d-ecke.de
         Resolution|---                         |FIXED

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