[M12N] Small error

Section B.3.2 of XHTML M12N mentions the groups ‘Misc.extra’ and 
‘Misc.class’, this should be xhtml.Misc.extra and xhtml.Misc.class. 
Ditto for the schema driver in section B.4.1.


~Grauw

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Ushiko-san! Kimi wa doushite, Ushiko-san nan da!!