Add documentation to Support onboarding

Greg Myersrequested to merge
docs-first-support-onboarding into master

MVC is a two-for-one:

  • Add documentation training to Support onboarding issue template.
  • Link ticket deflection and docs-first in documentation training module.

Closes support-team-meta#2892 (closed)

@cynthia WDYT?

Edited by Rebecca Spainhower

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