[7.10] Update known-plugins.asciidoc (#75388)#80845

Merged

gchaps merged 1 commit intoelastic:7.10from gchaps:backport/7.10/pr-75388

Oct 16, 2020

+1-1

Commits on Oct 16, 2020

Fix merge conflict

wolframhaussig
authored and
gchaps
committed