docs: Fix the circularReveal example.

int cy = (myView.getTop() + myView.getBottom()) / 2;

// get the final radius for the clipping circle

int finalRadius = myView.getWidth();

int finalRadius = Math.max(myView.getWidth(), myView.getHeight());

// create and start the animator for this view

// (the start radius is zero)

// create the animator for this view (the start radius is zero)

Animator anim =

    ViewAnimationUtils.createCircularReveal(myView, cx, cy, 0, finalRadius);

// make the view visible and start the animation

myView.setVisibility(View.VISIBLE);

anim.start();

</pre>