ContextHubManager: Document InstanceInfo bug

Our getNanoAppInstanceInfo() method returns incorrect information
for several fields in many cases.  We're too late in the release
cycle to fix the core of this issue, but we can at least document
it so users aren't surprised.

Bug: 30944457
Change-Id: I9330c3b77d08c36befbe20258c6cc45dc640f103
1 file changed