update sentinel add hot param flow rule case

spring-cloud-alibaba-examples/sentinel-example/sentinel-core-example/src/main/java/org/springframework/cloud/alibaba/cloud/examples/TestController.java

@@ -23,6 +23,12 @@ public class TestController {
 		return "Hello";
 	}
 
+	@RequestMapping(value = "/aa", method = RequestMethod.GET)
+    @SentinelResource("aa")
+	public String aa(int b, int a) {
+		return "Hello test";
+	}
+
     @RequestMapping(value = "/test", method = RequestMethod.GET)
     public String test1() {
         return "Hello test";

spring-cloud-alibaba-examples/sentinel-example/sentinel-core-example/src/main/resources/flowrule.json

@@ -8,9 +8,9 @@
     "strategy": 0
   },
   {
-    "resource": "p",
+    "resource": "/test",
     "controlBehavior": 0,
-    "count": 1,
+    "count": 0,
     "grade": 1,
     "limitApp": "default",
     "strategy": 0

spring-cloud-alibaba-examples/sentinel-example/sentinel-core-example/src/main/resources/param-flow.json

@@ -1,6 +1,6 @@
 [
   {
-    "resource": "hotResource",
+    "resource": "aa",
     "count": 0,
     "grade": 1,
     "limitApp": "default",