Fix obsolete advice in RelativeLayout's documentation.

/**

 * A Layout where the positions of the children can be described in relation to each other or to the

 * parent. For the sake of efficiency, the relations between views are evaluated in one pass, so if

 * view Y is dependent on the position of view X, make sure the view X comes first in the layout.

 * parent.

 *

 * <p>

 * Note that you cannot have a circular dependency between the size of the RelativeLayout and the