Add note for option llvm.download-ci-llvm #148933
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From https://rust-lang.zulipchat.com/#narrow/channel/326414-t-infra.2Fbootstrap/topic/.E2.9C.94.20Updating.20llvm.20submodule.20may.20cost.20much.20time.2C.20can.20we.20skip.2E.2E.2E/with/555335665
I found we already have related note in rustc-dev, it's more helpful to add this in exmaple configuration file.