Split steps for known and unknown passwords

What does this MR do and why?

Split steps for known and unknown passwords

• Move the steps for a forgotten password to be in its own section
• Update the text and reference where the "Forgot your password?" text is
• Clarify the reset text appears whether email exists or not
• Update note to clarify that primary email is needed for authentication

MR acceptance checklist

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requested review from @alvin

assigned to @irisb

added Support Team Contributions label

requested review from @idurham

added documentation label

	1 Warning
	The master pipeline status page reported failures in ui-docs-links lint If these jobs fail in your merge request with the same errors, then they are not caused by your changes. Please check for any on-going incidents in the incident issue tracker or in the #master-broken Slack channel.

	1 Message
	This merge request adds or changes documentation files and requires Technical Writing review. The review should happen before merge, but can be post-merge if the merge request is time sensitive.

Documentation review

The following files require a review from a technical writer:

• doc/user/profile/user_passwords.md (Link to current live version)

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Proper labels assigned to this merge request. Please ignore me.

@irisb - please see the following guidance and update this merge request.

	1 Error
	Please add typebug typefeature, or typemaintenance label to this merge request.

added docs-only label

@irisb , couple small suggestions here for you. Nice job on splitting this up!

requested changes

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changed milestone to %17.10

added Technical Writing groupauthentication labels

added Category:System Access devopssoftware supply chain security sectionsec labels

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• e6aba46a - Apply 4 suggestion(s) to 1 file(s)

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mentioned in commit 49fb8146

added workflowstaging-canary label

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mentioned in issue gitlab-com/support/support-team-meta#6719 (closed)

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