chore: Update user-facing language about setting

Description

@viktomas, as you requested in feat: introduce enabledWithoutGitlabProject Duo... (!1841 - merged), here's a revision of the user-facing language. Did I keep the right shade of meaning?

Related Issues

• Related to feat: introduce enabledWithoutGitlabProject Duo... (!1841 - merged) (this MR is essentially a post-merge review)
• Related to Add a setting to enforce "duoFeaturesEnabled" c... (#1425 - closed) which was the source of the work

How has this been tested?

Screenshots (if appropriate)

What CHANGELOG entry will this MR create?

• fix: Bug fix fixes - a user-facing issue in production - included in changelog
• feature: New feature - a user-facing change which adds functionality - included in changelog
• BREAKING CHANGE: (fix or feature that would cause existing functionality to change) - should bump major version, mentioned in the changelog
• None - other non-user-facing changes