dillon1000/react

avoid the phrase "key property"

React components can be assigned a special property named `key`. Therefore, it's helpful to avoid the phrase "key property" unless you're talking about the `key` property :)

I'm not sold on the replacement phrase, though... I think it's solid, but two fancy words like "fundamental" and "invariant" next to each other just seem a bit unwelcoming xP then again, we're talking about some heavy technical stuff; if there aren't any lighter words that are equally precise, then these should probably stand.