Polish the documentation for VectorDrawable and AnimatedVectorDrawable

 * </p>

 * <p>

 * First is the XML file for {@link android.graphics.drawable.VectorDrawable}.

 * Note that we allow the animation happen on the group's attributes and path's

 * attributes, which requires they are uniquely named in this xml file. Groups

 * Note that we allow the animation to happen on the group's attributes and path's

 * attributes, which requires they are uniquely named in this XML file. Groups

 * and paths without animations do not need names.

 * </p>

 * <li>Here is a simple VectorDrawable in this vectordrawable.xml file.

 * </vector>

 * </pre></li>

 * <p>

 * Second is the AnimatedVectorDrawable's xml file, which defines the target

 * Second is the AnimatedVectorDrawable's XML file, which defines the target

 * VectorDrawable, the target paths and groups to animate, the properties of the

 * path and group to animate and the animations defined as the ObjectAnimators

 * or AnimatorSets.

 * </animated-vector>

 * </pre></li>

 * <p>

 * Last is the Animator xml file, which is the same as a normal ObjectAnimator

 * Last is the Animator XML file, which is the same as a normal ObjectAnimator

 * or AnimatorSet.

 * To complete this example, here are the 2 animator files used in avd.xml:

 * rotation.xml and path_morph.xml.

 * the other. Note that the paths must be compatible for morphing.

 * In more details, the paths should have exact same length of commands , and

 * exact same length of parameters for each commands.

 * Note that the path string are better stored in strings.xml for reusing.

 * Note that the path strings are better stored in strings.xml for reusing.

 * <pre>

 * <set xmlns:android="http://schemas.android.com/apk/res/android">

 *     <objectAnimator

 * <p/>

 * <dt><code>&lt;vector></code></dt>

 * <dl>

 * <dd>Used to defined a vector drawable

 * <dd>Used to define a vector drawable

 * <dl>

 * <dt><code>android:name</code></dt>

 * <dd>Defines the name of this vector drawable.</dd>

 * <dt><code>android:width</code></dt>

 * <dd>Used to defined the intrinsic width of the drawable.

 * <dd>Used to define the intrinsic width of the drawable.

 * This support all the dimension units, normally specified with dp.</dd>

 * <dt><code>android:height</code></dt>

 * <dd>Used to defined the intrinsic height the drawable.

 * <dd>Used to define the intrinsic height the drawable.

 * This support all the dimension units, normally specified with dp.</dd>

 * <dt><code>android:viewportWidth</code></dt>

 * <dd>Used to defined the width of the viewport space. Viewport is basically

 * <dd>Used to define the width of the viewport space. Viewport is basically

 * the virtual canvas where the paths are drawn on.</dd>

 * <dt><code>android:viewportHeight</code></dt>

 * <dd>Used to defined the height of the viewport space. Viewport is basically

 * <dd>Used to define the height of the viewport space. Viewport is basically

 * the virtual canvas where the paths are drawn on.</dd>

 * <dt><code>android:tint</code></dt>

 * <dd>The color to apply to the drawable as a tint. By default, no tint is applied.</dd>

 * <dt><code>android:name</code></dt>

 * <dd>Defines the name of the path.</dd>

 * <dt><code>android:pathData</code></dt>

 * <dd>Defines path string. This is using exactly same format as "d" attribute

 * <dd>Defines path data using exactly same format as "d" attribute

 * in the SVG's path data. This is defined in the viewport space.</dd>

 * <dt><code>android:fillColor</code></dt>

 * <dd>Defines the color to fill the path (none if not present).</dd>

 * <dt><code>android:name</code></dt>

 * <dd>Defines the name of the clip path.</dd>

 * <dt><code>android:pathData</code></dt>

 * <dd>Defines clip path string. This is using exactly same format as "d" attribute

 * <dd>Defines clip path using the same format as "d" attribute

 * in the SVG's path data.</dd>

 * </dl></dd>

 * </dl>