Update backup communications methods
Why is this change being made?
More clearly outline Slack+Zoom/Hangouts hierarchy for backup communications.
Does this MR meet the acceptance criteria?
Assign to DRI
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Did you assign this change to the correct DRI of the page or information you are changing?
Conformity
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Added description to this MR explaining the reasons for the proposed change, per say-why-not-just-what
Edited by Emilie Schario