Remove invalid javadoc link to VideoView

Before this change, the MediaPlayer javadoc referenced VideoView's
javadoc, even though it was not relevant. The link can be removed
because a correct link is provided further down in MediaPlayer's
javadoc to the MediaPlayer guide.

Bug: 182880215
Bug: 182798119
Change-Id: Ife353257e10f73ef319f1913c9e59046e4ec10ce