[7.7][docs] Backport: Activate 7.7 blog link (#18107)#18499

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dedemorton merged 1 commit intoelastic:7.7from dedemorton:backport_18107_7.7

May 15, 2020

+2-2

Commits on May 13, 2020

[docs} Activate 7.7 blog link (elastic#18107 )
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