[v9.2.x] Add and document option for enabling email lookup (#918) (#677) #686
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Add and document option for enabling email lookup (grafana#913)
Docs: Document option for enabling email lookup
Add the new config in the config files
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Don't capitalize identity providers
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(cherry picked from commit 8380bc7d6a79794cc260bf1c427e2b4e849adbf6)
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