Update doc/administration/geo/setup/index.md
What does this MR do and why?
With the goal of ticket reduction in mind, we should emphasize both imperatives mentioned in Step 1 of the Geo setup documentation.
MR acceptance checklist
This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.
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I have evaluated the MR acceptance checklist for this MR.