Add documentation for the callback parameter of http.ClientRequest's and
http.ServerResponse's end methods.
Signed-off-by: Julien Gilli <julien.gilli@joyent.com>
If `data` is specified, it is equivalent to calling
`response.write(data, encoding)` followed by `response.end(callback)`.
+If `callback` is specified, it will be called when the response stream
+is finished.
## http.request(options[, callback])
If `data` is specified, it is equivalent to calling
`request.write(data, encoding)` followed by `request.end(callback)`.
+If `callback` is specified, it will be called when the request stream
+is finished.
+
### request.abort()
Aborts a request. (New since v0.3.8.)