fix: update cli help link to relevant wiki (#1378)

Author: DinoWw

java/src/processing/mode/java/Commander.java

@@ -401,7 +401,7 @@ static void printCommandLine(PrintStream out) {
     out.println("be passed through to the sketch itself, and therefore available to the");
     out.println("sketch via the 'args' field. To pass options understood by PApplet.main(),");
     out.println("write a custom main() method so that the preprocessor does not add one.");
-    out.println("https://github.com/processing/processing/wiki/Command-Line");
+    out.println("https://github.com/processing/processing4/wiki/Command-Line");
     out.println();
   }