Re: [selectors-api] Minor formatting nit

Boris Zbarsky wrote:
> has the "must" in lowercase and red text, whereas all other MUSTs I see 
> are uppercase and a different font from the rest of the text.

There are similar issues in section 2.1, in the text starting:

   While resolving either a prefix or the default namespace, if
   the lookupNamespaceURI() method returns undefined or null,

-Boris