fix syntax

(cherry picked from commit b417980)

gateway/gateway.yaml

@@ -6,7 +6,7 @@ spring.config.import: application.yaml, security.yaml, routes.yaml, roles-mappin
 
 georchestra:
   gateway:
-    # Redirection URL after a successfull logout : Default to /?logout
+    # Redirection URL after a successful logout : Defaults to /?logout
     # logoutUrl : "/?logout" 
     default-headers:
       # Default security headers to append to proxied requests