Merge \\\"Delete the NDK docs from Git. They\\\'re now in Piper, as per:...

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 am: 6a8fa04b
am: f2597fe9

Change-Id: Iddb4f00f8fbbdc39d420e92acba88b3228e6efe9