This PR fixes #15 by making the following changes:

• Adds the "[Deprecated in DPUB-ARIA 1.1]" label to the start of the definitions for doc-biblioentry and doc-endnote per the precedent for the directory role in ARIA 1.2
• Adds a note to each role explaining why it has been deprecated and to use list/listitem when html lists can't be used (and that a doc-footnote can be embedded in the list item in place of endnote).
• Removes the paragraphs that required these roles to be children of a list, as it doesn't make sense to leave invalid guidance.
• Removes required parent relationships from the roles and also removes them as required child roles from doc-bibliography and doc-endnotes.

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