docs: fix action bar style example

    </style>

    <!-- style for the action bar tab text -->

    <style name="CustomTabTextStyle">

    <style name="CustomTabTextStyle" parent="@android:style/TextAppearance.Holo">

        <item name="android:textColor">#2456c2</item>

    </style>

</resources>

manifest file like this:</p>

<pre>

<application android:theme="@style/CustomActivityTheme"

             ... />

<application android:theme="@style/CustomActivityTheme" ... />

</pre>

<p>For more information about using style and theme resources in your application, read <a

parent action bar style such as {@link android.R.style#Widget_Holo_ActionBar

Widget.Holo.ActionBar}.</p>

<p>For example, if you want to change the action bar's background, you could use the following

<p>For example, if you want to change the action bar's background, you can use the following

styles:</p>

<pre>

<resources>

    <!-- the theme applied to the application or activity -->

    <style name="CustomActivityTheme" parent="@android:style/Theme.Holo">

        <item name="android:actionBarTabTextStyle">@style/customTabTextStyle</item>

        <item name="android:actionBarStyle">@style/MyActionBar</item>

        <!-- other activity and action bar styles here -->

    </style>

    <!-- style for the action bar, simply to change the background -->

    <style parent="@android:style/Widget.Holo.ActionBar">

    <!-- style for the action bar backgrounds -->

    <style name="MyActionBar" parent="@android:style/Widget.Holo.ActionBar">

        <item name="android:background">@drawable/ab_background</item>

        <item name="android:backgroundSplit">@drawable/ab_background</item>

        <item name="android:backgroundStacked">@drawable/ab_background</item>

        <item name="android:backgroundSplit">@drawable/ab_split_background</item>

    </style>

</resources>

</pre>