docs: Documented DHU's --adb <port> flag
docs: Documented DHU's --adb <port> flag

See first comment for doc stage location.

bug:23721209
Change-Id: If4ce6e72cce555b72176a77c9b3f2d552b71f54e

xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base