Add ⚡️ content to `Onboarding` > `Creating a new wallet`

[pavlenex]

Describe your content request

Notes from Jam Session 15

• First use vs creating a new wallet? Should we rename it?
• Worrying about backup vs worry when you receive funds

Link to the page
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https://bitcoin.design/guide/onboarding/creating-a-new-wallet/

Why would you like to change the content?
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Suggestions
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Additional context

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Content guidelines
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[danielnordh]

Doc with suggested edits here, for comments before a PR.

[danielnordh]

WIP doc with suggested changes here.

[Bosch-0]

Can close this with #531 ?

[danielnordh]

Replaced/fixed by #531