clinic: fix config.json described as a directory instead of a file

[yahonda]

What is changed, added or deleted? (Required)

"Configuration data: in the `config.json` directory of each node" incorrectly calls `config.json` a directory. `clinic-data-instruction-for-tiup.md` in this same repo documents `config.json` as the per-component "Real-time configuration" file (e.g. for TiDB, TiKV, PD, TiFlash), consistent with its `.json` extension.

Source-code verification: in the `pingcap/diag` (Clinic/tiup diag) source, `collector/config.go` builds a `configs` list of `rtConfig{"config.json", ...}` entries per component, then downloads each one to `filepath.Join(resultDir, host, instDir, "conf", config.filename)` — i.e. `config.json` is written out as a literal file at `.../conf/config.json` under each node's own subdirectory, confirming it is a file, not a directory.

Which TiDB version(s) do your changes apply to? (Required)

• master (the latest development version)
• v8.5 (TiDB 8.5 versions)
• v8.4 (TiDB 8.4 versions)
• v8.3 (TiDB 8.3 versions)
• v8.2 (TiDB 8.2 versions)
• v8.1 (TiDB 8.1 versions)
• v7.5 (TiDB 7.5 versions)
• v7.1 (TiDB 7.1 versions)
• v6.5 (TiDB 6.5 versions)

What is the related PR or file link(s)?

• This PR is translated from:
• Other reference link(s):

AI agent involvement

• The changes in this PR were primarily made by an AI agent on behalf of the PR author.

Do your changes match any of the following descriptions?

• Delete files
• Change aliases
• Need modification after applied to another branch
• Might cause conflicts after applied to another branch

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ℹ️ Recent review info

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📥 Commits

Reviewing files that changed from the base of the PR and between 8d85871 and 17c2a2f.

📒 Files selected for processing (1)

• clinic/clinic-user-guide-for-tiup.md

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📝 Walkthrough

Walkthrough

The clinic user guide now states that configuration data is stored in each node's config.json file.

Changes

Clinic user guide

Layer / File(s)	Summary
Correct configuration storage path clinic/clinic-user-guide-for-tiup.md	Step 3 now identifies the configuration data location as the config.json file under each node's directory.

Priority: ⬇️ Low

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

Change: Other

Merge Risk: ⚪ Minimal · up to 17c2a

The guide now correctly identifies config.json as a per-node configuration file, with no runtime impact.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0…
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.
Description check	✅ Passed	The description explains the documentation correction, identifies the applicable TiDB version, provides supporting references, records AI involvement, and addresses the change-category checklist. It i…
Title check	✅ Passed	The title clearly and concisely describes the main change: correcting config.json from a directory description to a file description.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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