Add warnings for ACP 4.2.1 upgrade known issues

[chinameok]

Summary by CodeRabbit

• Documentation
  • Added Known Issue warnings for ACP 4.2.1 in global and workload cluster upgrade flows, advising users not to re-run the Upgrade action (to avoid unintended downgrades) and guidance to set component targets to "Do not upgrade" when applicable.
  • Minor help-text correction (typo fix).

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[coderabbitai]

Walkthrough

Documentation updates add Known Issue warnings to global and workload cluster upgrade procedures for ACP 4.2.1, advising users not to re-click the Upgrade button after completion to avoid component downgrades. A minor wording correction was also applied.

Changes

Cohort / File(s)	Summary
Upgrade documentation warnings docs/en/upgrade/upgrade_global_cluster.mdx, docs/en/upgrade/upgrade_workload_cluster.mdx	Inserted Known Issue warning blocks (ACP 4.2.1) after key upgrade steps advising users not to click Upgrade again after completion to prevent downgrades. Minor text correction (awared → aware).

Sequence Diagram(s)

(omitted — changes are documentation-only warnings and do not introduce a new multi-component control flow)

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Possibly related PRs

• doc: get upgrade instructions ready for 4.2.x #352 — Edits the same upgrade documentation files and introduces upgrade-flow warnings for 4.2.x.
• install, upgrade for acp 4.1 and fix dr #104 — Modifies the upgrade_global_cluster and upgrade_workload_cluster docs with related upgrade-flow/UI behavior changes.

Suggested reviewers

• youyongsong

Poem

🐰 A hop through the upgrade guide so fine,
I warn "Don't click twice" in tidy rhyme,
One press to upgrade, then stop and stare,
Avoid the downgrade — handle with care,
Hooray for safe clusters, one hop at a time! 🎉

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately summarizes the main change: adding warnings for ACP 4.2.1 upgrade known issues, which is reflected in both modified documentation files.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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📜 Recent review details

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between 7bd67b6 and f0cb7a7.

📒 Files selected for processing (1)

• docs/en/upgrade/upgrade_global_cluster.mdx

🚧 Files skipped from review as they are similar to previous changes (1)

• docs/en/upgrade/upgrade_global_cluster.mdx

⏰ Context from checks skipped due to timeout of 90000ms. You can increase the timeout in your CodeRabbit configuration to a maximum of 15 minutes (900000ms). (1)

• GitHub Check: Pipelines as Code CI / doc-pr-build-container-platform

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