[css-variables] Clean up the Ignored Value line.

Author: tabatkins

css-variables/Overview.bs

@@ -12,7 +12,7 @@ Previous Version: http://www.w3.org/TR/2013/WD-css-variables-20130312/
 Previous Version: http://www.w3.org/TR/2012/WD-css-variables-20120410/
 Editor: Tab Atkins Jr., Google, http://xanthir.com/contact
 Abstract: This module introduces cascading variables as a new primitive value type that is accepted by all CSS properties, and custom properties for defining them.
-Ignored Terms: --0, --foo, --main-color, --Bar, --two, --header-color, --accent-background, --foo-bar, --bar, --one, var, <ident>, declarations, case-insensitive, getproperty()
+Ignored Terms: --foo, case-insensitive, getproperty()
 Link Defaults: css-color-3 (property) color, cssom-1 (interface) cssstyledeclaration
 </pre>