refactor(orx-syphon): rename alternate RenderTarget demo to DemoServer02

Add header comment to explain what this demo does

Author: ArthurVimond

…in/ServerExampleAlternateRenderTarget.kt …x-syphon/src/demo/kotlin/DemoServer02.ktorx-jvm/orx-syphon/src/demo/kotlin/ServerExampleAlternateRenderTarget.kt renamed to orx-jvm/orx-syphon/src/demo/kotlin/DemoServer02.kt orx-jvm/orx-syphon/src/demo/kotlin/ServerExampleAlternateRenderTarget.kt renamed to orx-jvm/orx-syphon/src/demo/kotlin/DemoServer02.kt

@@ -7,6 +7,8 @@ import kotlin.math.abs
 import kotlin.math.cos
 import kotlin.math.sin
 
+/* This demo uses an alternate RenderTarget to send frames to Syphon (instead of the entire screen).
+* */
 fun main() {
     // force to use GL driver
     System.setProperty("org.openrndr.gl3.gl_type", "gl")