fix: correct stream handling and protocol dialing in example code

[sumanjeet0012]

Title

fix: correct stream handling and protocol dialing in example code

Description

This PR addresses issues in the commented-out example code that would prevent it from working if uncommented:

1. Fixed stream data handling: Added .subarray() when reading from the stream to properly handle buffer data in the active code.

2. Fixed protocol dialing in commented code:

   • Added missing await keyword when dialing a protocol

   • Changed from node2.peerId to node2.getMultiaddrs() for correct addressing

3. Fixed data encoding in commented code: Added uint8ArrayFromString() to properly encode string messages

These changes ensure the example code will work correctly when users uncomment it for their own implementations, providing a reliable reference for libp2p protocol and stream muxing.

Notes & open questions

Change checklist

• I have performed a self-review of my own code
• I have made corresponding changes to the documentation if necessary (this includes comments as well)
• I have added tests that prove my fix is effective or that my feature works