docs: update vagrant link
As pointed out in https://f-droid.org/forums/topic/documentation-bug-fix-report/#post-21839 , the link to the vagrant doc is 404. I'd assume that this is the correct link, but please verify this before merge.
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
As pointed out in https://f-droid.org/forums/topic/documentation-bug-fix-report/#post-21839 , the link to the vagrant doc is 404. I'd assume that this is the correct link, but please verify this before merge.