Update Test::Integration::Geo documentation
What does this MR do and why?
As noted in gitlab#392980 (closed) / gitlab#442777 the behaviour of the Geo scenario has changed from testing replication to testing UI proxying. With that in mind, we should update the docs to better describe that reality here to avoid any confusion around what this is actually testing.
NB - Adjust Geo QA test wording (gitlab!120056 - merged) has previously been implemented to update the test wording
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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Commits include Changelog:
trailer -
I have evaluated the [MR acceptance checklist](https://docs .gitlab.com/ee/development/code_review.html#acceptance-checklist) for this MR.