fix json indent

specification/modules/end_to_end_encryption.rst

@@ -280,7 +280,10 @@ An event encrypted using Olm has the following format:
           "<device_curve25519_key>": {
             "type": 0,
             "body": "<base_64>"
-    } } } }
+          }
+        }
+      }
+    }
 
 ``ciphertext`` is a mapping from device Curve25519 key to an encrypted payload
 for that device. ``body`` is a Base64-encoded Olm message body. ``type`` is an