[Issue 18400] Add an man page for ddemangle

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=18400

Mathias LANG <pro.mathias.lang at gmail.com> changed:

           What    |Removed                     |Added
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             Status|NEW                         |RESOLVED
                 CC|                            |pro.mathias.lang at gmail.com
         Resolution|---                         |MOVED

--- Comment #1 from Mathias LANG <pro.mathias.lang at gmail.com> ---
Moved to https://github.com/dlang/tools/issues/395

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