docs: Updating TV recording API docs for N DP3
docs: Updating TV recording API docs for N DP3

Updating TV recording docs: change for TvInputManager.updateTvInputInfo(),
adding info on new android:canRecord attribute.

Bug: 28451239

Change-Id: I11bdb41245c5aedec566211b853293ed079c140c

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