[docs] Fix External IAM Policy Docs

[philnielsen]

This feature was renamed during its development and a remnant of that original name was in the docs. Fixing this because it confused me enough to have to look up what the correct config was in the code.

[linux-foundation-easycla]

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• ✅ login: philnielsen / name: Phillip Nielsen (d978c30)

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[rifelpet]

/ok-to-test

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