[Docs] Clarify registry feature description in FAQ

[jgoldschrafe]

Description

The current wording of the FAQ implies that the registry option is enabled by default, which can lead to users losing data. This change updates the registry description to make obvious that this is a supported configuration option, but not a default one.

Checklist

• Unit tests updated
• End user documentation updated

[linux-foundation-easycla]

The committers are authorized under a signed CLA.

• ✅ Jeff Goldschrafe (585536f)

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[jgoldschrafe]

/assign @njuettner

[seanmalloy]

/check-cla

[seanmalloy]

/kind documentation

[seanmalloy]

/lgtm
/assign @njuettner @Raffo

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[njuettner]

/lgtm

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This pull-request has been approved by: jgoldschrafe, njuettner

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