Update API docs for ACTION_NEW_OUTGOING_CALL broadcast.

Starting in Android 15, after a 5 year deprecation, this broadcast is no
longer sent as an ordered broadcast, and it no longer gives the receiver
foreground priority and the ability to launch background activities.
These changes were made for performance and security reasons.

Bug: 224550864
Test: Docs only change
Change-Id: I2ad00cc8314c7bba1affda78e93f8ff951bd25f9