Add docs for `"commands".Command.Run`

To clarify that if you want to access the request body after writing need to use
multipart requests.

License: MIT
Signed-off-by: Jan Winkelmann <j-winkelmann@tuhh.de>

commands/command.go

@@ -55,6 +55,11 @@ type Command struct {
 	Options   []Option
 	Arguments []Argument
 	PreRun    func(req Request) error
+
+	// Run is the function that processes the request to generate a response.
+	// Note that when executing the command over the HTTP API you can only read
+	// after writing when using multipart requests. The request body will not be
+	// available for reading after the HTTP connection has been written to.
 	Run        Function
 	PostRun    Function
 	Marshalers map[EncodingType]Marshaler