[7.x] Add throttle param to Alerting readme (#57609)#58162

Merged

Zacqary merged 1 commit intoelastic:7.xfrom Zacqary:backport/7.x/pr-57609

Feb 20, 2020

+2

Commits on Feb 20, 2020

Add throttle param to Alerting readme (elastic#57609 )

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