BAEL-2988 Make the code consistent with the article. (#7870)

* BAEL-2988 Make the code consistent with the article.

* BAEL-2988 Use @GetMapping annotation based on the feedback.

spring-rest-simple/src/main/java/com/baeldung/cors/EnumController.java

@@ -1,6 +1,7 @@
 package com.baeldung.cors;
 
 import org.springframework.web.bind.annotation.CrossOrigin;
+import org.springframework.web.bind.annotation.GetMapping;
 import org.springframework.web.bind.annotation.PathVariable;
 import org.springframework.web.bind.annotation.RequestMapping;
 import org.springframework.web.bind.annotation.RequestParam;
@@ -13,12 +14,12 @@ import com.baeldung.model.Modes;
 @RequestMapping("/enums")
 public class EnumController {
 
-    @RequestMapping("/mode2str")
+    @GetMapping("/mode2str")
     public String getStringToMode(@RequestParam("mode") Modes mode) {
         return "good";
     }
 
-    @RequestMapping("/findbymode/{mode}")
+    @GetMapping("/findbymode/{mode}")
     public String findByEnum(@PathVariable Modes mode) {
         return "good";
     }

spring-rest-simple/src/main/java/com/baeldung/model/Modes.java

@@ -1,5 +1,5 @@
 package com.baeldung.model;
 
 public enum Modes {
-    ALPHA, DELTA
+    ALPHA, BETA;
 }