Merge \"docs: Added link to API diff between M and N\" into nyc-dev

<p>Beginning with the Preview 4 release, the API reference for the

  N platform (API level 24) is now available online at <a href=

  "{@docRoot}reference/">developer.android.com/reference/</a>.

</p>

<p>If you'd like an offline copy of the API reference, you can download it

from the following table. The download also includes an incremental diff report

for API changes between the Preview 3 and Preview 4 release, which is not

available online.</p>

<table>

  <tr>

    <th scope="col">Documentation</th>

    <th scope="col">Checksums</th>

  </tr>

  <tr>

    <td style="white-space: nowrap">

    <a href="{@docRoot}shareables/preview/n-preview-4-docs.zip"

      >n-preview-4-docs.zip</a></td>

    <td width="100%">

      MD5: f853e3ba0707083336dfa780b8fed9a7<br>

      SHA-1: 36fcbc497cc2e63b1bc1d629c304b0ba43a88946

    </td>

  </tr>

</table>

  "{@docRoot}reference/">developer.android.com/reference/</a>. There is also

  an incremental diff report for <a href="{@docRoot}sdk/api_diff/24/changes.html"

  >API changes between API levels 23 and 24</a>.</p>

<h2 id="java8">Get the Java 8 JDK</h2>