Update introduction.rst

Author: k4r4c

docs/introduction.rst

@@ -212,7 +212,7 @@ In the next step, we declare the protocol by means of the Reo file called ``main
 	import reo.fifo1;
 
 	// The main component
-	main(a,b,c) { red(a) green(b) blue(c) alternator(a,b,c) }
+	main(a,b,c) { green(a) red(b) blue(c) alternator(a,b,c) }
 	
 	// The atomic components
 	red(a!String) { Java: "Processes.Red" }