docs: Updated button width in documentation/reactivity

[mayankjain25]

Fixed button width in order to avoid the changing width of the button in the result when the text changes from 'time' to 'times'

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[PuruVJ]

Hi! Thanks for this change! A few things:

• Can you use prettier extension if you are using VSCode.
• <style> block is supposed to be at the bottom of the file, after the markup finishes.
• App.svelte in app-b folder needs to be updated with the same change as well

[mayankjain25]

Thank you for the feedback! Have made the required changes as needed. Would request you to go through it.

[mayankjain25]

Thanks for approving! Is the PR good enough to be merged?