docs: Added note in LayoutTransition class reference that APPEARING and...

 * layout will run (closing the gap created in the layout when the item was removed). If this

 * default choreography behavior is not desired, the {@link #setDuration(int, long)} and

 * {@link #setStartDelay(int, long)} of any or all of the animations can be changed as

 * appropriate.</p>

 * appropriate. Keep in mind, however, that if you start an APPEARING animation before a

 * DISAPPEARING animation is completed, the DISAPPEARING animation stops, and any effects from

 * the DISAPPEARING animation are reverted. If you instead start a DISAPPEARING animation

 * before an APPEARING animation is completed, a similar set of effects occurs for the

 * APPEARING animation.</p>

 *

 * <p>The animations specified for the transition, both the defaults and any custom animations

 * set on the transition object, are templates only. That is, these animations exist to hold the