Change method name 'get' to 'getContentType', 'animate' to 'createTransition'

[pdhung3012]

The class OutputUnitsAffinityGroup is used to represent OutputUnitsAffinityGroup. This method named 'get' is to get element at the index type. Thus, the method name 'getContentType' is more intuitive than 'get'.

The class BoundsAnimationComponentSpec is used to represent BoundsAnimationComponentSpec. This method named 'animate' is to create a transition for the animation. Thus, the method name 'createTransition' is more intuitive than 'animate'.