docs: fix alignment and visiblity for await example in docs

[iustin05]

Updated the alignment and visiblity for the await example.

The last part is not visible when in a '>' md block.

[changeset-bot]

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Latest commit: f21f606

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[svelte-docs-bot]

Preview: https://svelte-dev-git-preview-svelte-17043-svelte.vercel.app/

[Rich-Harris]

Thank you but this is deliberate — the code block is part of the note, not part of the main content, and so it's aligned with the note copy.

Not sure what you mean 'the last part is not visible'? If you mean 'not visible if the page is too narrow', because the copy-to-clipboard button obscures the content, then this change only fixes that for certain very specific widths. It doesn't address the root issue (which could perhaps be hacked around by adding a few trailing non-breaking spaces to the first line of each code block)