[whatwg] a typo in 8.6.1 APIs for the browsing context selection

[Futomi Hatano]

I've found a typo in "8.6.1 APIs for the browsing context selection".
http://www.whatwg.org/specs/web-apps/current-work/multipage/editing.html#documentSelection

In the green box, we can find a definition as below.

collapsed = selection . isCollapsed()

As far as I've read the section 8.6.1, I understand that isCollapsed isn't a method, but an IDL attribute.
So, I think it should be as below.

collapsed = selection . isCollapsed

--
Futomi Hatano
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