Change wording to state exact times

What does this MR do?

The wording here indicates that the listed steps will help a user set their preference to relative times, but the steps call for a user to "Clear the Use relative times checkbox." which will set the users preference to use exact times.

This changes the wording of the checklist in the section to indicate that, when followed, the user's preferences will be set to use exact times.

Related issues

Author's checklist

• Optional. Consider taking the GitLab Technical Writing Fundamentals course.
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  • Style Guide.
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• ~"frontend"
• ~"backend"
• ~"type::bug"
• ~"database"

These labels cause the MR to be added to code verification QA issues.

Reviewer's checklist

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If you aren't sure which tech writer to ask, use roulette or ask in the #docs Slack channel.

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    • The headings should be something you'd do a Google search for. Instead of Default behavior, say something like Default behavior when you close an issue.
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