Merge \"docs: Clarifying direct boot notification messages\" into mnc-io-docs

<h2 id="notification">Getting Notified of User Unlock</h2>

<p>Once the user unlocks the device after restart, your app can switch to

<p>When the user unlocks the device after restart, your app can switch to

accessing credential encrypted storage and use regular system services that

depend on user credentials.</p>

<p>To get notified when the user unlocks the device after a reboot,

register a {@link android.content.BroadcastReceiver} from a running component

to listen for the <code>ACTION_USER_UNLOCKED</code> message. Or, you can

receive the existing {@link android.content.Intent#ACTION_BOOT_COMPLETED

ACTION_BOOT_COMPLETED} message, which now indicates the device has booted and

the user has unlocked the device.</p>

to listen for unlock notification messages. When the user unlocks the device

after boot:

</p>

<ul>

<li>If your app has foreground processes that need immediate notification,

listen for the {@code ACTION_USER_UNLOCKED} message.</li>

<li>If your app only uses background processes that can act on a delayed

notification, listen for the

{@link android.content.Intent#ACTION_BOOT_COMPLETED ACTION_BOOT_COMPLETED}

message.</li>

</ul>

<p>You can directly query if the user has unlocked the device by calling

<p>If the user has unlocked the device, you can find out by calling

<code>UserManager.isUserUnlocked()</code>.</p>

<h2 id="migrating">Migrating Existing Data</h2>