[Issue 19398] Document meaning of core.atomic.MemoryOrder

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=19398

github-bugzilla at puremagic.com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |FIXED

--