History of XMLHttpRequest.send()

Removed a recommendation that the developer use the non-standard, deprecated, Gecko-only method sendAsBinary() for binary data.

Add an example

Removed unrelated Request.clone() stuff.

Added 'NeedsContent' tag, as the syntax (i.e. parameters, return value, exceptions) needs to be described

Removing {{draft}} as it has enough data to go around now.