Add erratum to 1.0 and backwards compatibility statement to 1.1.1 #2723
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This pull request updates the errata page for the EPUB Accessibility 1.0 specification to add an entry making the inclusion of an accessibilitySummary a recommendation instead of a requirement. It also notes that repeating information in the other metadata is not necessary, but this was never a requirement so publications that did repeat the info aren't non-conforming.
(The errata page will be published through a different process than the W3C specs.)
I've also re-integrated the changes from pull request #2527 that add a section on backwards compatibility.
Fixes #2526
Accessibility 1.0 Errata: Preview
Accessibility 1.1.1: Preview | Diff