Cherry-pick to 7.8: [docs] Fix Windows download link for agent (#20258)#20291

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dedemorton merged 1 commit intoelastic:7.8from dedemorton:backport/7.8/pr-20258

Jul 28, 2020

Commits on Jul 28, 2020

[docs] Fix Windows download link for agent (elastic#20258 )
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