[7.7] [DOCS] Updates remote cluster and ccr docs (#63517)#63764

Merged

gchaps merged 1 commit intoelastic:7.7from gchaps:backport/7.7/pr-63517

Apr 16, 2020

+100-52

Commits on Apr 16, 2020

[DOCS] Updates remote cluster and ccr docs (elastic#63517 )
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