chat: fix typos in js docs

src/pages/docs/chat/rooms/message-reactions.mdx

@@ -151,7 +151,7 @@ let messages = await room.messages.history({limit: 50});
 // subscribe to message reactions summary events
 room.messages.reactions.subscribe((event) => {
     // find the relevant message (in practice: use binary search or a map for lookups)
-    const idx = messages.findLastIndex((msg) => msg.serial === event.messageSerial);
+    const idx = messages.findLastIndex((msg) => msg.serial === event.summary.messageSerial);
     if (idx === -1) {
         // not found
         return;

src/pages/docs/chat/rooms/messages.mdx

@@ -627,7 +627,7 @@ room.messages.subscribe((event) => {
 room.messages.reactions.subscribe((event) => {
   const idx = myMessageList.findIndex((msg) => msg.serial === event.summary.messageSerial);
   if (idx !== -1) {
-    myMessageList[idx] = myMessageList[idx]with(event);
+    myMessageList[idx] = myMessageList[idx].with(event);
   }
 });
 ```

src/pages/docs/chat/rooms/presence.mdx

@@ -20,7 +20,7 @@ To enter the presence set of a room, use the [`usePresence`](#set) hook instead.
 <Code>
 ```javascript
 const { unsubscribe } = room.presence.subscribe((event) => {
-  console.log(`${event.clientId} entered with data: ${event.data}`);
+  console.log(`${event.member.clientId} entered with data: ${event.member.data}`);
 });
 ```