[MEDIA_PIPELINE_TF] 4.1.2 requirement change proposal

Here is a proposal for rewording requirement 4.1.2 to make it more specific.
4.1.2 The ABR specification must define how  video and audio elements can be used for playback of adaptive delivery formats.

In the past, the <obj> tag has been used to add non-standard functionality to HTML pages. In order to provide more consistent functionality, the <video> and <audio> elements were added to HTML. This allows for consistent handling of streaming media between different browsers and encoded with different codecs. In order to maintain this consistency with ABR media formats,any solution must define how the video and audio elements can be used for playback of adaptive delivery format media.

Bob Lund