Update javadoc to reflect that BluetoothPbap#setConnectionPolicy returns

true on successfully setting the connection policy instead of on
disconnection. It also now indicates that if
BluetoothProfile#CONNECTION_POLICY_FORBIDDEN is passed in, the profile
will be disconnected.

Bug: 148966894
Test: Manual
Change-Id: I881c240fcbce0c8148625c35e6e88ab02ea7122f