just added some quotes so the red json keys disappear. (#68)

nips/02.md

@@ -14,13 +14,13 @@ For example:
 
 ```json
 {
-  kind: 3,
-  tags: [
+  "kind": 3,
+  "tags": [
     ["p", "91cf9..4e5ca", "wss://alicerelay.com/", "alice"],
     ["p", "14aeb..8dad4", "wss://bobrelay.com/nostr", "bob"],
     ["p", "612ae..e610f", "ws://carolrelay.com/ws", "carol"]
   ],
-  content: "",
+  "content": "",
   ...other fields
 ```