Removes misleading note in quantum doc

fixes bug 1134849

As precisely report by Stephen Gordon in the bug report,
different quantum plugins use different databases with one
exception. As we're trying to reduce the cruft in the docs
and no longer cover every single exception, removing both
instances of the note.

Change-Id: If6e553bad6b1a4e78f29c859dfb69d84fd9aa609
Merge "Removes misleading note in quantum doc"