docs(studio) update 1.0.x release notes (#1587)
docs(studio) update 1.0.x release notes (#1587)

- Adds GraphQL video from GraphQL page.
- Changed GraphQL description to better describe the feature set
- Adds GraphQL section to TOC
Mashape/getkong.org,Mashape/getkong.org,Mashape/getkong.org