doc(WinBox): update style variable sample

[ArgoZhang]

update style variable sample

Summary of the changes (Less than 80 chars)

简单描述你更改了什么, 不超过80个字符；如果有关联 Issue 请在下方填写相关编号

Description

fixes #4715

Regression?

• [ ] Yes
• [ ] No

[If yes, specify the version the behavior has regressed from]

[是否影响老版本]

Risk

• [ ] High
• [ ] Medium
• [ ] Low

[Justify the selection above]

Verification

• [ ] Manual (required)
• [ ] Automated

Packaging changes reviewed?

• [ ] Yes
• [ ] No
• [ ] N/A

☑️ Self Check before Merge

⚠️ Please check all items below before review. ⚠️

• [ ] Doc is updated/provided or not needed
• [ ] Demo is updated/provided or not needed
• [ ] Merge the latest code from the main branch

Summary by Sourcery

Documentation:

• Update the style variable sample in the WinBox component documentation to reflect the use of built-in style variables.

[sourcery-ai[bot]]

Reviewer's Guide by Sourcery

This PR updates the WinBox style variable documentation sample by correcting the CSS class name and clarifying the description text in Chinese. The changes are focused on improving the accuracy of the documentation.

No diagrams generated as the changes look simple and do not need a visual representation.

File-Level Changes

Change	Details	Files
Updated WinBox styling documentation example	Changed CSS class name from '.winbox' to '.bb-win-box' to match the actual component class Updated Chinese description text to clarify that these are built-in style variables	src/BootstrapBlazor.Server/Components/Samples/WinBoxes.razor

Assessment against linked issues

Issue	Objective	Addressed	Explanation
#4715	Update the WinBox style variable sample documentation	✅

Possibly linked issues

• #4715: The PR updates style variable samples as described in the issue, making them directly related.

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[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 100.00%. Comparing base (98a6d98) to head (07a1f56). Report is 1 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #4716 +/- ## ========================================= Coverage 100.00% 100.00% ========================================= Files 620 620 Lines 27382 27382 Branches 3923 3923 ========================================= Hits 27382 27382 ```

:umbrella: View full report in Codecov by Sentry.
:loudspeaker: Have feedback on the report? Share it here.

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