Removed scheduler doc costs section

Since commit 820f43fc (Change-Id
Ie3e7611347c334c359dea98d759345b97c66c9c1)
costs are no longer used, so all references to them have been removed.

Change-Id: I6e02bc47643be9f9dfe9d2e42b2335626bf039e7
Merge "Removed scheduler doc costs section"