Wifi: Update to the WifiLock API documentation

This commit provides an update to the WifiLock types API documentation.
It adds the condition of the device to be connected to an access point
for lock to be active. This applies to both high perf and low latency
locks.

Bug: 127884567
Test: None
Change-Id: If65681939058a5d6508cf0a970517fa856cc04b3