Update MR homepage tutorial with view-specific info

Amy Quallsrequested to merge
535244-aqualls-dashboard-docs into master

What does this MR do and why?

Update the tutorial at doc/tutorials/merge_requests/homepage.md with new information on the changes to the MR homepage.

References

Related to [Feature flag] Enable mr_dashboard_list_type_to... (#535244 - closed)

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How to set up and validate locally

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Related to #535244 (closed)

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