Fix Broken links in devref/filter_scheduler.rst

There were broken links on the following class
'AggregateNumInstancesFilter', 'RamWeigher' in
document filter_scheduler.html. Fix these broken
links.

Change-Id: I3cac48a6ad466a32a88c23c9f128e66dae5889ee
Closes-Bug: #1363955
Merge "Fix Broken links in devref/filter_scheduler.rst"