tree bc3ecc7085f76c83dee4c3cd3ced083c84e52fb0
parent c63cdc2a190e6f5080fbe4d5dfd8d81bfcc3684b
author Cristián Donoso <donosoc@google.com> 1544139006 -0800
committer Cristián Donoso <donosoc@google.com> 1544145231 -0800

[fx debug] Update "fx debug" to use "fx default-device"

No explicit target can be given.
Also updated help for troubleshooting tips.

TEST=0/1/2 devices.

DX-757  # Done

Change-Id: Ibc72fba7f450ee067b925c4e1588c56e7950e812