Correcting javadoc for setPersonalAppsSuspended

Documentation for setPersonalAppsSuspended was incorrectly stating that
a persistent notifcation would be shown when the apps are suspended. No
such notification is shown, so removing this from the documentation.

BUG: 171477008
Change-Id: Ib52be890f17b59b3880f057f8e089410d569c277
Test: documentation-only change, no testing
Merged-in: Ib52be890f17b59b3880f057f8e089410d569c277