fix(ion-router-outlet): add closing slash for tag

Fix typo

Author: chernodub

snippets/angular/html.json

@@ -927,7 +927,7 @@
   },
   "ion-router-outlet": {
     "prefix": "i-router-outlet",
-    "body": ["<ion-router-outlet><ion-router-outlet>"],
+    "body": ["<ion-router-outlet></ion-router-outlet>"],
     "description": "<ion-router-outlet> should only be used with Angular projects"
   },
   "ion-row": {