added missing `stoppropagation` documentation

[shairez]

What is it?

• Docs / tests / types / typos

Description

We've added this feature back in April but it was never documented, this fixes it :)

Checklist

• [x] My code follows the developer guidelines of this project
• [x] I performed a self-review of my own code
• [x] I made corresponding changes to the Qwik docs

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Latest commit: 19b2eedfba125eb18fd59b5808c8c832c680838e

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