Update advanced search limit setting docs
What does this MR do and why?
I opened this MR because someone mentioned in a slack thread that the text was confusing. I also found an undocumented feature flag missing from the documentation so I added it.
This MR updates the advanced search limit indexing docs for administrators to know how the feature works.
References
Screenshots or screen recordings
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How to set up and validate locally
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Edited by Terri Chu