Append any text indicated by aria-describedby to wand output #175
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the aria-describedby attribute takes idrefs of elements whose text content is read out by screenreaders. It's a useful way of adding instructions to form fields that are accessible to screen reader users (see https://developer.paciellogroup.com/blog/2014/12/using-aria-describedby-to-provide-helpful-form-hints/)
This PR appends the text pointed to by aria-describedby on elements to the output of the 'screenreader wand' (and adds tests to the index.html page to see it in action)