Update wiki for various classes

[A6uh]

For the Bar Visualizer
Usage
<com.chibde.visualizer.BarVisualizer android:id="@+id/visualizer" android:layout_width="match_parent" android:layout_height="250dp"/>

For the Circle Bar Visualizer
Usage
<com.chibde.visualizer.CircleBarVisualizer android:id="@+id/visualizer" android:layout_width="match_parent" android:layout_height="250dp"/>

For the Circle Visualizer
Usage
<com.chibde.visualizer.CircleVisualizer android:id="@+id/visualizer" android:layout_width="match_parent" android:layout_height="match_parent"/>
(Also missing > at the end)

For the Line Bar Visualizer
Usage
<com.chibde.visualizer.LineBarVisualizer android:id="@+id/visualizer" android:layout_width="match_parent" android:layout_height="250dp"/>

For the Line Visualizer
Usage
<com.chibde.visualizer.LineVisualizer android:id="@+id/visualizer" android:layout_width="match_parent" android:layout_height="250dp"/>

However the final SquareBar Visualizer has the correct usage case.