[ink] i18n LC comment: xml:lang on XHTML example

Comment from the i18n review of:
http://www.w3.org/TR/2006/WD-InkML-20061023/

Comment 9
At http://www.w3.org/International/reviews/0612-inkML/
Editorial/substantive: E
Owner: RI

Location in reviewed document:
6.3.2

Comment: 
Please include xml:lang="en" on the html element of the embedded HTML example, to indicate best practice.