Add section on bulk assignment

What does this MR do and why?

Updates docs with information on new bulk assignment functionality for Duo Pro within GitLab.com. See https://gitlab.com/gitlab-org/gitlab/-/issues/455443 for more information.

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added GitLab.com Duo Pro Bulk Assignment Technical Writing groupprovision typefeature labels

assigned to @courtmeddaugh

added devopsfulfillment sectionfulfillment labels

added documentation label

	1 Message
	This merge request adds or changes documentation files. A review from the Technical Writing team before you merge is recommended. Reviews can happen after you merge.

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• doc/subscriptions/subscription-add-ons.md (Link to current live version)

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added docs-only label

requested review from @fneill and @mhamda

hey @fneill We are getting ready to launch bulk assignment via UI for Duo Pro seats for GitLab.com. This MR is to add info on how to do this to the existing bulk assignment documentation. Would you mind reviewing and providing input please?

Thanks, @courtmeddaugh, for the thorough and very clear instructions/docs!

I've got a couple of thoughts

approved this merge request

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removed review request for @mhamda