Ref T13410. See PHI1431. Currently, when you move a document in Phriction, the target shows a "This document was moved from ..." banner until it is edited.
This banner isn't particularly useful, and it's distracting and it isn't obvious how to dismiss it, and making a trivial edit to dismiss it is awkward.
This information is also already available in the transaction log.
Just remove this banner since it doesn't really serve any clear purpose.