Fixed misspath in put request of MockControlelr

src/main/java/com/release11/klaus/controller/MockController.java

@@ -34,7 +34,7 @@ public class MockController {
      * @return confirmation and 200 OK
      */
     @SneakyThrows
-    @PutMapping("/")
+    @PutMapping
     public ResponseEntity<String> updateMessage(@RequestBody String body){
         ObjectMapper mapper = new ObjectMapper();
         MockedMessageDto message = mapper.readValue(body, MockedMessageDto.class);