Fixes a typo on AggregateCoreFilter documentation

"AggregateRamFilter with per-aggregate CPU subscription flag" should be
"AggregateCoreFilter with per-aggregate CPU subscription flag"

Fixes bug 1197297

Change-Id: I4674f65d696312bb13d685f7b2d4db9f231b995e
Merge "Fixes a typo on AggregateCoreFilter documentation"