Update set_up_svs.rst

[KwadroNaut]

Fixes updated time settings menu

Status

Work in progress. Need to add a screenshot.

Description of Changes

• Tails got some updates, how you got to the settings in the gui has changed.

• Resolves # https://github.com/freedomofpress/securedrop-docs/issues/428

Checklist (Optional)

• [ ] Doc linting (make docs-lint) passed locally
• [ ] Doc link linting (make docs-linkcheck) passed
• [ ] You have previewed (make docs) docs at http://localhost:8000