docs: fix error in themes doc

<activity android:theme="@style/CustomTheme">

</pre>

<h3 id="SelectATheme">Select a theme based on platform version</h3>

<p>Newer versions of Android have additional themes available to applications,

and you may want to use these while running on those platforms while still being

and you might want to use these while running on those platforms while still being

compatible with older versions.  You can accomplish this through a custom theme

that uses resource selection to switch between different parent themes.</p>

that uses resource selection to switch between different parent themes, based on the platform

version.</p>

<p>For example, here is the declaration for a custom theme which is simply

the standard platforms default light theme.  It would go in an XML file under

<code>res/values</code> (typically <code>res/values/styles.xml</code>):

<pre>

<style name="LightThemeSelector" parent="android:Theme.Light">

    ...

</style>

</pre>

<p>To have this theme use the newer "holo" theme when the application is running

on {@link android.os.Build.VERSION_CODES#HONEYCOMB}, you can place another

declaration for it in a file in <code>res/values-11</code>:</p>

<p>To have this theme use the newer holographic theme when the application is running

on Android 3.0 (API Level 11) or higher, you can place an alternative

declaration for the theme in an XML file in <code>res/values-v11</code>, but make the parent theme

the holographic theme:</p>

<pre>

<style name="LightThemeSelector" parent="android:Theme.Holo.Light">

    ...

</style>

</pre>

<p>Now use this theme like you would any other, and your application will

automatically switch to the holo theme if running on

{@link android.os.Build.VERSION_CODES#HONEYCOMB} or later.</p>

automatically switch to the holographic theme if running on Android 3.0 or higher.</p>

<p>A list of the standard attributes that you can use in themes can be

found at {@link android.R.styleable#Theme R.styleable.Theme}.</p>

<p>For more information about providing alternative resources, such as themes and layouts, based

on the platform version or other device configurations, see the <a

href="{@docRoot}guide/topics/resources/providing-resources.html">Providing Resources</a>

document.</p>

<!-- This currently has some bugs

<h3 id="setThemeFromTheApp">Set the theme from the application</h3>