[ime-api] Remove reference to ime-mode? (#1)

The Introduction section of the spec references the ime-mode property defined in the CSS3 UI as a "standard" and the latest WD of that spec [1] says that property is now obsolete. As such, perhaps the related text should be deleted.

If that text is kept, the fragment ([1]) should be updated (possibly to [2]) because currently the "ime-mode" ID does not exist in [1]

[1] http://www.w3.org/TR/css3-ui/#ime-mode
[2] http://www.w3.org/TR/css3-ui/#input-method-editor


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https://github.com/w3c/ime-api/issues/1