[Issue 18059] New: DDOC_MEMBER is undocumented

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=18059

          Issue ID: 18059
           Summary: DDOC_MEMBER is undocumented
           Product: D
           Version: D2
          Hardware: All
                OS: All
            Status: NEW
          Severity: normal
          Priority: P1
         Component: dlang.org
          Assignee: nobody at puremagic.com
          Reporter: issues.dlang at jmdavisProg.com

https://dlang.org/spec/ddoc.html does not mention DDOC_MEMBER, but
https://github.com/dlang/dmd/blob/master/res/default_ddoc_theme.ddoc has it,
and the the dlang.org repo's html.ddoc has it.

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