BassClient: Minor adjustments of some logs and comments

Patch adjusts some comment and logs for better readability.

Test: atest BluetoothInstrumentationTests
Test: presubmit
Tag: #feature
Bug: 150670922
Bug: 229965085
Sponsor: jpawlowski@
Change-Id: I64fdf5bde8d8d9d0217098fc6d16c188678c4137
Merged-In: I64fdf5bde8d8d9d0217098fc6d16c188678c4137
(cherry picked from commit 457bb996)