Update client-side-scripts.mdx

[jazsouf]

Description

The 'constructor()' method is never mentioned in any piece of code in the page.
And from what I understand, it's the 'connectedCallback()' method that runs each time the browser finds a custom element in the DOM.

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[ArmandPhilippot]

Nice catch, the code snippet has been updated in #9314 but we forgot to update the steps... So, thank you! And welcome to Team Docs 🥳