[CSSOM] Typos

We have noticed the following typos in the CSSOM [1] spec:

1. In the DocumentStyle interface, the enableStylesheetsForSet method is the only one where Stylesheets is spelled this way instead of StyleSheets. (I don't have a preference either way, just noting the inconsistency and assuming it unintentional)
2. In the stylesheet set enablement algorithm [2], the second clause states: "2.Set the style sheet disabled flag for each style sheet in a style sheet set whose style sheet set name is a case-sensitive match for name to *false* and set it to false for all other style sheets in a style sheet set." The boolean value between ** should be true.


[1] http://dev.w3.org/csswg/cssom/
[2] http://dev.w3.org/csswg/cssom/#enabled-style-sheet-set