Cherry-pick #19110 to 7.8: [Filebeat] Update input docs#19278

Merged

andrewkroh merged 1 commit intoelastic:7.8from andrewkroh:backport_19110_7.8

Jun 18, 2020

+4-2

Commits on Jun 18, 2020

Update filebeat input docs (elastic#19110 )
andrewkroh
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