Clarify Node vs NodeList method docs

Node and NodeList both import methods from DOM.  The doc comments seem to have been written for NodeList and copy/pasted for Node.  It didn't make sense for a Node method to act on 'each node' so the wording has been clarified.
Merge remote-tracking branch 'solmsted/patch-1' into live-docs
[node] Build

min files are no changes.