[7.9] Update index privileges doc to include data streams (#59139)#60170

Merged

danhermann merged 1 commit intoelastic:7.9from danhermann:backport_79_59139_doc_ds_privs

Jul 24, 2020

+15-13

Commits on Jul 24, 2020

Update index privileges doc to include data streams (elastic#59139 )
danhermann
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