Fix curl command for Spring example (#478)

Signed-off-by: Averi Kitsch <[email protected]>

Author: averikitsch

examples/restful-ws-spring-boot/README.md

@@ -11,11 +11,11 @@ mvn spring-boot:run
 You can try sending a request using `curl`:
 
 ```shell
-curl -X POST -v -d '{"username": "slinkydeveloper", "firstName": "Francesco", "lastName": "Guardiani", "age": 23}' \                                                                                                                       ~
-    -H'Content-type: application/json' \
-    -H'Ce-id: 1' \
-    -H'Ce-source: cloud-event-example' \
-    -H'Ce-type: happybirthday.myapplication' \
-    -H'Ce-specversion: 1.0' \
+curl -X POST -v -d '{"username": "slinkydeveloper", "firstName": "Francesco", "lastName": "Guardiani", "age": 23}' \
+    -H 'Content-type: application/json' \
+    -H 'Ce-id: 1' \
+    -H 'Ce-source: cloud-event-example' \
+    -H 'Ce-type: happybirthday.myapplication' \
+    -H 'Ce-specversion: 1.0' \
     http://localhost:8080/happy_birthday
 ```