docs: Updating N Preview "behavior changes" doc for DP5

  to the trusted credentials storage via Settings UI separately, with a

  DER-encoded format under a .crt or .cer file extension.

  </li>

  <li>Starting in Android N, fingerprint enrollment and storage are managed per user.

  If a profile owner’s Device Policy Client (DPC) targets pre-N on an N device,

  the user is still able to set fingerprint on the device, but work

  applications cannot access device fingerprint. When the DPC targets N and

  above, the user can set fingerprint specifically for work profile by going to

  <strong>Settings &gt; Security &gt; Work profile security</strong>.

  </li>

  <li>A new encryption status <code>ENCRYPTION_STATUS_ACTIVE_PER_USER</code> is

  returned by <code>DevicePolicyManager.getStorageEncryptionStatus()</code>, to

  indicate that encryption is active and the encryption key is tied to the

  user. The new status is only returned if DPC targets API Level 24 and above.

  For apps targeting earlier API levels, <code>ENCRYPTION_STATUS_ACTIVE</code>

  is returned, even if the encryption key is specific to the user or profile.

  </li>

</ul>

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