Merge \"Merge \\"Merge \\\"Delete the NDK docs from Git. They\\\'re now in...

Merge \"Merge \\"Merge \\\"Delete the NDK docs from Git. They\\\'re now in Piper, as per: https://critique.corp.google.com/#review/126357681\\\" into nyc-dev am: 5460fef9\\" into nyc-mr1-dev am: b50f3fb0\" into nyc-mr1-dev-plus-aosp
am: db401023

Change-Id: Ib93ac0e2cc3365406dfd731cfe025fbd6c5a82dd