fix json indentation

docs/sources/http_api/admin.md

@@ -36,11 +36,10 @@ HTTP/1.1 200
 Content-Type: application/json
 
 {
-"DEFAULT":
-{
-  "app_mode":"production"},
-  "analytics":
-  {
+  "DEFAULT": {
+  "app_mode":"production"
+  },
+  "analytics": {
     "google_analytics_ua_id":"",
     "reporting_enabled":"false"
   },
@@ -340,4 +339,4 @@ HTTP/1.1 200
 Content-Type: application/json
 
 {state: "new state", message: "alerts pause/un paused", "alertsAffected": 100}
-```
+```