[8.6] [Guided onboarding] Copy update for the Security rules step (#1…

…45887) (#146103)

# Backport

This will backport the following commits from `main` to `8.6`:
- [[Guided onboarding] Copy update for the Security rules step
(#145887)](#145887)

<!--- Backport version: 8.9.7 -->

### Questions ?
Please refer to the [Backport tool
documentation](https://github.com/sqren/backport)

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