add link to gen ai reference docs

Author: vraspar

mobile/examples/phi-3/android/app/src/main/java/ai/onnxruntime/genai/demo/MainActivity.java

@@ -140,6 +140,7 @@ public void run() {
 
                             generatorParams = model.createGeneratorParams();
                             //examples for optional parameters to format AI response
+                            // https://onnxruntime.ai/docs/genai/reference/config.html
                             generatorParams.setSearchOption("length_penalty", lengthPenalty);
                             generatorParams.setSearchOption("max_length", maxLength);