Merge \"Merge \\\"docs: Edits to Instant Apps FAQs, index page.\\\" into nyc-dev am: 7a4d857c45 am: 8c8a5e9296\" into nyc-mr1-dev-plus-aosp
am: dec361d2e9

Change-Id: Ib234c05ac5f6134bd2375cbbf560ce3b4e8a9da1