fix JSON format

Author: szuperaz

packages/client/docusaurus/docs/javascript/02-guides/16-closed-captions.mdx

@@ -28,17 +28,17 @@ If closed captions are enabled for a given call, you'll receive the captions in
 
 ```
 {
-    "type": "call.closed_caption",
-    "created_at": "2024-09-25T12:22:25.067005915Z",
-    "call_cid": "default:test",
-    "closed_caption": {
-        "text": "Thank you, guys, for listening.",
-        // When did the speaker start speaking
-        "start_time": "2024-09-25T12:22:21.310735726Z",
-        // When did the speaker finish saying the caption
-        "end_time": "2024-09-25T12:22:24.310735726Z",
-        "speaker_id": "zitaszuperagetstreamio"
-    }
+  "type": "call.closed_caption",
+  "created_at": "2024-09-25T12:22:25.067005915Z",
+  "call_cid": "default:test",
+  "closed_caption": {
+      "text": "Thank you, guys, for listening.",
+      // When did the speaker start speaking
+      "start_time": "2024-09-25T12:22:21.310735726Z",
+      // When did the speaker finish saying the caption
+      "end_time": "2024-09-25T12:22:24.310735726Z",
+      "speaker_id": "zitaszuperagetstreamio"
+  }
 }
 ```