format(all): json formatting

09.md

@@ -12,7 +12,7 @@ The event's `content` field MAY contain a text note describing the reason for th
 
 For example:
 
-```
+```jsonc
 {
   "kind": 5,
   "pubkey": <32-bytes hex-encoded public key of the event creator>,
@@ -24,7 +24,7 @@ For example:
     ["k", "30023"]
   ],
   "content": "these posts were published by accident",
-  ...other fields
+  // other fields...
 }
 ```