Improve javadocs of some DPM APIs

FIX: 70332970
FIX: 73919570
FIX: 67495520
FIX: 71566404

Test: None

Change-Id: Ic9b485ff7c15e0d244cba9e71def8d5c41e52070
(cherry picked from commit 8309c8f7608cea212056ace1cedb8af4df1215e3)
1 file changed