Update link to EMQX documentation.

[whiteneon]

Proposed Changes

Existing link to documentation regarding environment variables is stale. Changed to point to latest v5 version of EMQX documentation.

Summary by CodeRabbit

• Documentation
  • Updated the env_vars guidance to point to the current EMQX environment variables documentation page.
  • Replaced an outdated reference with the latest official documentation link.

[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: 3b89d090-c7e0-46e2-93c1-d2796f988219

📥 Commits

Reviewing files that changed from the base of the PR and between 11bc911 and 127452e.

📒 Files selected for processing (1)

• emqx/DOCS.md

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Walkthrough

Updated a single documentation link in emqx/DOCS.md, replacing the EMQX v5.0 environment-variables admin config URL with the current EMQX v5.10 documentation URL.

Changes

Documentation Link Update

Layer / File(s)	Summary
Update env_vars reference link emqx/DOCS.md	Replaced the outdated v5.0 www.emqx.io admin config link with the official v5.10 environment variables documentation URL.

Estimated code review effort: 1 (Trivial) | ~2 minutes

Poem

A tiny hop, a tiny fix,
One link updated in the mix,
From old v5.0 to v5.10's page,
This rabbit turns a docs new page 🐇📄
Thump-thump, the change is done!

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 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 change: a documentation link was updated to the latest EMQX docs.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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