2.1 level 3 needs rewording

2.1 currently says:

Level 3 Success Criteria for Guideline 2.1

   "1. All of the functionality of the content is operable via a keyboard
or keyboard interface."


This is not possible if level 1 criteria is true.  So level 3 is not about
making all content keyboard operable, but in not putting anything on the
site (or page) that can't be operated by keyboard. 

So it should say something like:

	"1. Content is designed so that it can all be operated via
keyboard."

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