Add documentation on enabling admin mode

What does this MR do?

Adds documentation on enabling admin mode.

Related issues

! 331508

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added Technical Writing devopsfoundations docsimprovement documentation featureenhancement groupauthentication and authorization [DEPRECATED] twdoing typefeature workflowready for review labels

assigned to @jglassman1

added sectiondev 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.

Documentation review

The following files require a review from a technical writer:

• doc/user/admin_area/settings/sign_in_restrictions.md (Link to current live version)

The review does not need to block merging this merge request. See the:

• Metadata for the *.md files that you've changed. The first few lines of each *.md file identify the stage and group most closely associated with your docs change.
• The Technical Writer assigned for that stage and group.
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If needed, you can retry the danger-review job that generated this comment.

Generated by Danger

Questions for clarification:

• Is it just administrators who can enable admin mode?
• When enabling admin mode, are permissions different depending on the method you use?
• Is it just administrators who can activate admin mode?
• I've made an assumption with the placeholder in the API call. Is the instance URL?
• I've made an assumption for the content on what happens with admin mode is deactivated or disabled. I've put it as both. Is this correct?

mentioned in issue #331508 (closed)

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• f44a9b75 - Fix broken link

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marked this merge request as ready

requested review from @dblessing and @eread

Thank you @dblessing for answering my questions, tagging you and @eread for review.

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requested review from @eread

@eread thanks for the suggestions, I've made changes based on them. PTAL when you have a chance.

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requested review from @rdickenson and removed review request for @eread

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approved this merge request

merged

@eread @jglassman1 - I've reviewed, approved, and merged this MR.

mentioned in commit 4f239137

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mentioned in merge request gitlab-com/www-gitlab-com!115396 (merged)

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