Added note to attribute binding page about reserved words as attrubutes breaking in ie8

Until I knew this it caused me a lot of irritation - debugging in ie8 isn't the best experience. There is some disparate chatter about this on some stack overflow posts but it didn't appear high up on Google search results. I stopped short of putting all the reserved words inline - and have only tested a dozen or so. 

This could perhaps be a part of the previous note - but personally I like my docs explicit.