Fixed broken link in the documentation of Events

[piotrwitek]

Fixes #3446

Changes proposed in this pull request: Fixed broken link in the documentation of Events

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[chrome-devrel-review-bot]

Hello! This is an automated review by our custom reviewbot. It updates automatically when code or GitHub comments in this pull request are created or updated.

Requested changes

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site/en/docs/extensions/reference/events/index.md

• This file passed all of our automated Markdown audits.

[AmySteam]

@piotrwitek Thanks for this PR! 👍

@dotproto LGTM, let me know if you want to add anything.