Follow-up tweaks to `Backing up a wallet` updates

[GBKS]

Found a couple of minor things that I should have brought up during the review of #541.

• I think the term "Fingerprint" is misleading. Everyone will automatically think of their IRL fingerprint (especially when seeing the icon) and wonder what that's about. We should clarify this and ideally come up with a better term (and icon).
• Need to add the redirect info, as the page and URL were changed (from guide/onboarding/backing-up-a-recovery-phrase.md to guide/onboarding/backing-up-a-wallet.md).
• We should change the page description to get away from the recovery phrase focus (the reason why the page name and URL were changed). It currently reads Handling recovery phrases during onboarding.

[Bosch-0]

I think the term "Fingerprint" is misleading.

Personally I would just remove the mention of this and derivation path and say output descriptor which encompasses both these pieces of data and is a standard we should be pushing for. Though we should give a more human readable name to this - maybe something like "Wallet data" or something.

[GBKS]

Output descriptor is a format though, it contains information but is not the information in itself. For designers, I think it's good to understand what pieces of information to consider, and then be aware of the formats and techniques to handle them.

[pavlenex]

@GBKS Do you want to address these as part of the Milestone 11?

[GBKS]

@pavlenex yessir, just added it.