fix: modify document internationalization conversion issue

[James-9696]

PR

修复以下问题：

已修复：

PR Checklist

Please check if your PR fulfills the following requirements:

• The commit message follows our Commit Message Guidelines
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

• Bugfix
• Feature
• Code style update (formatting, local variables)
• Refactoring (no functional changes, no api changes)
• Build related changes
• CI related changes
• Documentation content changes
• Other... Please describe:

What is the current behavior?

Issue Number: N/A

What is the new behavior?

Does this PR introduce a breaking change?

• Yes
• No

Other information

Summary by CodeRabbit

• Documentation
  • Updated the mention feature documentation sidebar label and page title, removing the @ symbol for a cleaner presentation.

[coderabbitai]

Walkthrough

The changes remove the @ symbol from the mention feature's display label and heading across documentation. The sidebar navigation item and documentation title are both updated from @提醒 to 提醒, with all links and content remaining unchanged.

Changes

Cohort / File(s)	Summary
Documentation & Navigation packages/docs/fluent-editor/.vitepress/sidebar.ts, packages/docs/fluent-editor/docs/demo/mention.md	Removed leading @ symbol from mention feature label in sidebar navigation and documentation title heading.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Poem

🐰 A @ symbol bid goodbye,
From labels high and headings nigh,
Now "提醒" stands clean and bright,
The mention feature gleams in light! ✨

🚥 Pre-merge checks | ✅ 1 | ❌ 2

❌ Failed checks (2 warnings)

Check name	Status	Explanation	Resolution
Title check	⚠️ Warning	The title claims to fix a 'document internationalization conversion issue', but the actual changes only remove '@' symbols from Chinese text labels in sidebar navigation and a markdown heading.	Use a more accurate title like 'fix: remove @ prefix from mention demo navigation and title' or 'fix: update mention demo display text' that directly describes the actual changes made.
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (1 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.

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✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix-docs-probblem

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