Document mobile team menu join and leave in v2.40.0

[Combs7th]

Summary

Adds mobile-app instructions for joining and leaving a team via the new bottom-sheet team menu introduced in Mattermost Mobile v2.40.0 (mattermost/mattermost-mobile#9721).

• source/end-user-guide/collaborate/organize-using-teams.rst — adds mobile join/leave paragraphs under the existing Join a team and Leave a team sections; existing warning about channel removal preserved.
• source/end-user-guide/access/client-availability.rst — marks Leave team as supported on Mobile.

Closes #8968

Test plan

• Verify RST renders correctly in preview
• Verify cross-reference to leave a team anchor still resolves

Generated with Claude Code

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⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

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Run ID: c66d8378-a282-45e6-aadf-a7fd62b73302

📥 Commits

Reviewing files that changed from the base of the PR and between e7f9e4c and 5c4dc03.

📒 Files selected for processing (2)

• source/end-user-guide/access/client-availability.rst
• source/end-user-guide/collaborate/organize-using-teams.rst

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch claude/issue-8968-20260514-0202

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[Combs7th]

@jgheithcock - Are the above doc updates accurate?

[github-actions]

Newest code from mattermost has been published to preview environment for Git SHA 5c4dc03