Fix typo: reference to cooldown in Dependabot options reference docs

[luke-symes]

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Source	Review	Production	What Changed
code-security/dependabot/working-with-dependabot/dependabot-options-reference.md	fpt ghec ghes@ 3.18 3.17 3.16 3.15 3.14	fpt ghec ghes@ 3.18 3.17 3.16 3.15 3.14

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[Sharra-writes]

@luke-symes Thanks for the fix! I'll get this approved and added to the merge queue once the checks are passing.

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