Merge "Docs:  Developer written case studies batch 3 (proj 31)" into nyc-dev am: cae752e66b am: 95db2e6f48 am: 03d1aa4b25 am: 20e4d93302
am: 45a897158d

Change-Id: Ice64344c75cd8ddd95cb90644d4978dae1f53914