Review A: Updated content for choice table elements

I’ve reworked some of the content in the following topics: <choicetable>: “Usage information” and “Examples” <chdesc>: Short description Best, Kris Kristen James Eberlein Chair, OASIS DITA Technical Committee Owner, Eberlein Consulting LLC 
Skype: kriseberlein; voice: +1 (919) 622-1501 Attachment: tc-review-a-updated-choicetable-element.pdf Description: tc-review-a-updated-choicetable-element.pdf