Doc: remove addressbook-sdk.qdoc from help dependencies

The file has been removed.

Change-Id: I8102eecb2a71a02166c670e4de4ebf48479ceff4
Reviewed-by: Leena Miettinen <riitta-leena.miettinen@digia.com>
Doc: fix styling issues

Add missing \endlist and remove a \li to keep related information in the same list item.

Change-Id: I91f1d2d7915b915b67e4e038244e912789f37b24
Reviewed-by: Leena Miettinen <riitta-leena.miettinen@digia.com>