v4.3 3.2.13 subtitle @codecs misleading

[mikedo]

3.2.13 says:

Subtitle Adaptation Set: An Adaptation Set that contains visual overlay information to be rendered as auxiliary or accessibility information. Such an Adaptation Set is identified by @MimeType="application/mp4", a Role descriptor with @schemeIdUri=" urn:mpeg💨role:2011" and @value="subtitle" and, an @codecs 6 parameter as defined in Table 23or "application/ttml+xml".

This is about the Role descriptor but the sentence throws in a recommendation about @codecs. Also, it must be set per Table 23 (W3C profile registry), and not ever set to "application/ttml+xml"