Fix incorrect API comments of getSubId()

getSubid() return the SubscriptionManager#getDefaultSubscriptionId()
when TelephonyManager created without the subId.

Bug: 111453847
Test: Build
Merged-In: I8e38ef43b5f23bbedc4d584df78c12f250b88fcc
Change-Id: I8e38ef43b5f23bbedc4d584df78c12f250b88fcc
1 file changed