docs(auth): Clarify Google SSO username/email sync behavior

[Combs7th]

Adds a sentence to the existing user-attribute note in the Google SSO setup guide clarifying that username and email address changes made in Google Workspace are not automatically synced to Mattermost.

Aligns with mattermost/mattermost#34475.

Closes #8831

Generated with Claude Code

[Combs7th]

@devinbinnie - Do the above doc updates look accurate to you here?

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: a236f2bd-4e78-40fb-9b34-de63bc60fc09

📥 Commits

Reviewing files that changed from the base of the PR and between 8162094 and 78f6fcc.

📒 Files selected for processing (1)

• source/administration-guide/onboard/sso-google.rst

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📝 Walkthrough

Walkthrough

A documentation update was made to the Google SSO onboarding guide to clarify that changes to usernames and email addresses in Google Workspace are not automatically synchronized to Mattermost.

Changes

Cohort / File(s)	Summary
Google SSO Documentation source/administration-guide/onboard/sso-google.rst	Added a clarifying note documenting that username and email address modifications in Google Workspace are not automatically synced to Mattermost for SSO users.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately describes the primary change: adding documentation clarification about Google SSO username/email sync behavior.
Description check	✅ Passed	The description is directly related to the changeset, explaining that a clarifying sentence was added to the Google SSO setup guide regarding username and email sync behavior.
Linked Issues check	✅ Passed	The PR addresses the core objective from #8831 by adding a clarifying note about Google SSO username/email sync behavior to the documentation, aligning with the engineering PR #34475.
Out of Scope Changes check	✅ Passed	The changeset is limited to adding a single note about Google SSO sync behaviour in the appropriate documentation file, with no unrelated modifications.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch claude/issue-8831-20260324-2330

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[github-actions]

Newest code from mattermost has been published to preview environment for Git SHA 78f6fcc

[devinbinnie]

Yep, changes look good, just need to revert the extra stuff in here.

[Combs7th]

Thanks @devinbinnie! Unintended changes have been reverted. @esethna - This one should be ready to go.

[github-actions]

Newest code from mattermost has been published to preview environment for Git SHA 4289754

[Combs7th]

Thanks @devinbinnie! Unintended changes have been reverted. @esethna - This one should be ready to go.

[github-actions]

Newest code from mattermost has been published to preview environment for Git SHA 3085c26

[github-actions]

Newest code from mattermost has been published to preview environment for Git SHA 376254d