Doc: Fix broken links and "Cannot find base function" errors

"qtgui" dependency is not needed, but others are.

Change-Id: I883f0c3dd2c41b9073231bae5b1eccffc76e140c
Reviewed-by: Topi Reiniö <topi.reinio@digia.com>
Merge remote-tracking branch 'origin/stable' into dev

Change-Id: Ia6e9b1180bd3125a40bf7f244fbf4c9b0e9766a2