Add better summary of ndarraytype.h to release notes.
Add better summary of ndarraytype.h to release notes.

git-svn-id: 77a43f9646713b91fea7788fad5dfbf67e151ece@8401 94b884b6-d6fd-0310-90d3-974f1d3f35e1

teoliphant/numpy-refactor,Ademan/NumPy-GSoC,teoliphant/numpy-refactor,jasonmccampbell/numpy-refactor-sprint,teoliphant/numpy-refactor,Ademan/NumPy-GSoC,teoliphant/numpy-refactor,jasonmccampbell/numpy-refactor-sprint,jasonmccampbell/numpy-refactor-sprint,Ademan/NumPy-GSoC,teoliphant/numpy-refactor,Ademan/NumPy-GSoC,jasonmccampbell/numpy-refactor-sprint