Fix broken sample

Author: joshiste

spring-boot-admin-samples/spring-boot-admin-sample/src/main/resources/application.yml

@@ -9,11 +9,11 @@ spring:
     name: @pom.artifactId@
   boot:
     admin:
-      url=http://localhost:8080
+      url: http://localhost:8080
   cloud:
     config:
       enabled: false
 
 endpoints:
   health:
-    sensitive: false
+    sensitive: false