There are a few updates here:
1. Fix the size of one of the existing boxes to fit the text.
2. Add a note at the top that anything about alternatives is
future work since that didn't merge in Pike.
3. Add a box to note the call from scheduler to placement to
make the "claim".
Change-Id: I8b6468766f4924d009b2567fe71c2f5d2733a6e3
30fad527b2