docs: fix TiDB Cloud file system casing to match the product name

[yahonda]

What is changed, added or deleted? (Required)

Fixes an inconsistent casing of the "TiDB Cloud Filesystem" product name. 11 places across 7 ai/ti/reference/ pages' Options sections used the lowercase generic wording "TiDB Cloud file system" instead of the product's branded name "TiDB Cloud Filesystem", which is used consistently 243 times elsewhere in the same directory (including these same files' own titles and other option descriptions).

Found while reviewing a Japanese i18n sync PR for this content.

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)

This ai/ti/ (TiDB Cloud CLI) content currently exists only on the v8.5 branch, not on master.

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

🤖 Generated with Claude Code

Summary by CodeRabbit

• Documentation
  • Updated TiDB Cloud Filesystem terminology across filesystem command references.
  • Standardized capitalization in option descriptions for copying, linking, layering, deleting, describing, mounting, and packaging files.
  • No command behavior, option defaults, or functionality changed.

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No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: ASSERTIVE

Plan: Advanced

Run ID: 2da35fd0-1d44-4926-bfa9-96bee624753f

📥 Commits

Reviewing files that changed from the base of the PR and between 6acba5d and f6f7852.

📒 Files selected for processing (7)

• ai/ti/reference/ti-fs-copy-file.md
• ai/ti/reference/ti-fs-create-hardlink.md
• ai/ti/reference/ti-fs-create-layer.md
• ai/ti/reference/ti-fs-delete-file.md
• ai/ti/reference/ti-fs-describe-file.md
• ai/ti/reference/ti-fs-mount-file-system.md
• ai/ti/reference/ti-fs-pack-file-system.md

Included review availability: Your plan provides up to 4 included reviews per hour; 3 remain after this review.

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📝 Walkthrough

Walkthrough

The pull request updates seven TiDB CLI reference documents to use “TiDB Cloud Filesystem” consistently. It changes option descriptions only. Command behavior and defaults remain unchanged.

Changes

Filesystem terminology

Layer / File(s)	Summary
Reference wording normalization ai/ti/reference/ti-fs-*.md	Option descriptions use “TiDB Cloud Filesystem” instead of “TiDB Cloud file system”. No functional or default-value changes are made.

Priority: ⬇️ Low

Estimated code review effort: 1 (Trivial) | ~3 minutes

Change: Other

Suggested reviewers: icemap

Merge Risk: ⚪ Minimal · up to f6f78

This terminology-only documentation change does not alter CLI behavior or defaults and is ready to merge.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly describes the documentation change: correcting the casing of the TiDB Cloud Filesystem product name.
Description check	✅ Passed	The description explains the change, identifies the affected version, records AI involvement, and addresses the applicable checklist items. The empty reference-link fields are not required for this do…
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.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/tidb-cloud-filesystem-casing

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