[7.x][docs] Backport: Add link to observability release blog (#16246)#16256

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dedemorton merged 1 commit intoelastic:7.xfrom dedemorton:backport_16246_7.x

Feb 11, 2020

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Commits on Feb 11, 2020

[docs] Add link to observability release blog (elastic#16246 )
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