ddoc - modules with same name

[armando sano via Digitalmars-d-learn]

> I could never get this working. Have you got an example of your 
> compiler command.

In case that's still helpful after a couple of years...:

     dmd path1/to/source.d path2/to/source.d -o- -D -Ddpath/to/doc 
-op

generates `path/to/doc/path1/to/source.html` and 
`path/to/doc/path2/to/source.html`