Doc: Removed non-existing Qt modules in the qdocconf depends variable.

-they cause unnecessary warnings.
-new modules should be entered one-by-one once they are made into
 official Qt 5 modules.

Change-Id: I9ab2e4422a2933f6aa52bf6b290041f4fe5dede6
Reviewed-by: Topi Reiniö <topi.reinio@digia.com>