Merge "doc: Update N Preview release notes for DP2." into mnc-mr-docs
am: 5f8bdb9

* commit '5f8bdb9fba0a8ffa748cbe5995fc438ffa0dbd4b':
  doc: Update N Preview release notes for DP2.

Change-Id: I179a6edd192e04dbac9b84813ac9cacb0c2259d7