Docs: Update Auth section of API Overview

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  <h2>Key developer features</h2>

 authentication capabilities will be more powerful; apps will have new ways to

 authenticate.</p>

<h4>Users can enter a username and password on a watch</h4>

<p>Google Keyboard will be standard on Android Wear, allowing for direct text

entry. This feature will work as expected with standard

<a href="{@docRoot}reference/android/widget/EditText.html">EditText widgets</a>.

For passwords, the {@code textPassword} attribute will be used.</p>

<h4>Utilizing Account Manager</h4>

<p>Android Wear will include the

<a href="{@docRoot}reference/android/accounts/AccountManager.html">

AccountManager</a>, which will be accessible for syncing and storing account

data, as it is on an Android phone.</p>

<h4>Authentication tokens can be passed over the Wearable Data Layer</h4>

<p>For Android-paired watches (only), the phone will securely transfer authentication

 data to a watch app via the

<p>For Android-paired watches (only), a phone securely

transfers authentication credentials to a watch app via the

<a href="{@docRoot}training/wearables/data-layer/index.html">

 Wearable Data Layer API</a>. The data can be transferred as

 Messages or Data Items. </p>

Wearable Data Layer API</a>. The credentials can be transferred as

messages or data items.</p>

<p>If your watch app needs to determine if your phone app is installed, you can

advertise a capability on the phone app and retrieve the capability on the watch.

 For more information, see following sections of

advertise a capability on the phone app and retrieve the capability on the

watch. For more information, see the following sections of

<a href="{@docRoot}training/wearables/data-layer/messages.html">

 Sending and Receiving Messages</a>:

Sending and Receiving Messages</a>:</p>

<ul>

  <li>Advertise Capabilities</li>

  <li>Retrieve the Nodes with the Required Capabilities</li>

</ul>

<h4>Users can enter a username and password on a watch</h4>

<p>Google Keyboard will be standard on Android Wear, allowing for direct text entry.

 This feature will work as expected with standard

 <a href="{@docRoot}reference/android/widget/EditText.html">

  EditText widgets</a>. For passwords, the {@code textPassword} attribute will be

   used.

<h4>Utilizing Account Manager</h4>

Android Wear will include the <a href="{@docRoot}reference/android/accounts/AccountManager.html">

AccountManager</a>, which will be accessible for syncing and storing account

 data, as it is on an Android phone.

</p>