Typo in subscribe migration guide

[Joro97]

There is a small typo in the subscribe migration guide. This PR should fix it.

Steps to reproduce the behavior

1. Open https://docs.web3js.org/guides/web3_upgrade_guide/subscribe_migration_guide/#subscribing-to-events
2. Read the third bullet under "Differences"
3. "...you code..." should become "...your code..."

Logs

Typo can be seen highlighted on the image below. "...you code..." should become "...your code..."

Environment

Tested on latest Brave + macOS version.

[mconnelly8]

Thanks @Joro97, the team will review the PR.