doc(ExportPdfButton): update export sample code

[ArgoZhang]

update export sample code

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 #4841

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:

• Updated the export sample code in the documentation.

[sourcery-ai]

Reviewer's Guide by Sourcery

This PR updates the export sample code to display data using Display components instead of EditorForm.

Class diagram showing component structure changes

classDiagram
    class ExportPdfButtons {
        +OnBeforeExport()
        +OnAfterDownload()
        +PdfFileName: string
    }

    class Display {
        +Value: object
        +ShowLabel: bool
        +DisplayText: string
    }

    class GroupBox {
        +Title: string
    }

    ExportPdfButtons --> GroupBox
    GroupBox --> Display : contains

    note for Display "Replaced EditorForm\nwith Display components"

Loading

File-Level Changes

Change	Details	Files
Replaced EditorForm with Display components for data presentation	Removed ValidateForm and EditorForm components. Added Display components for Name, Address, DateTime, and Education fields. Used a grid layout with form-inline class for better data organization.	src/BootstrapBlazor.Server/Components/Samples/ExportPdfButtons.razor

Assessment against linked issues

Issue	Objective	Addressed	Explanation
#4841	Fix the issue where form control data (text boxes, date inputs, etc.) are not being exported to PDF	✅

Possibly linked issues

• bug(ExportPdfButton): 导出pdf控件的数据会丢失 #4841: The PR fixes the issue by updating the export sample code.
• bug(ExportPdfButton): 导出pdf控件的数据会丢失 #4841: The PR fixes the issue by updating the sample code to correctly display the data in the PDF export.
• bug(ExportPdfButton): 导出pdf控件的数据会丢失 #4841: The PR updates the sample code for PDF export and fixes the issue where PDF export was failing.

---

Tips and commands

Interacting with Sourcery

• Trigger a new review: Comment @sourcery-ai review on the pull request.
• Continue discussions: Reply directly to Sourcery's review comments.
• Generate a GitHub issue from a review comment: Ask Sourcery to create an
  issue from a review comment by replying to it.
• Generate a pull request title: Write @sourcery-ai anywhere in the pull
  request title to generate a title at any time.
• Generate a pull request summary: Write @sourcery-ai summary anywhere in
  the pull request body to generate a PR summary at any time. You can also use
  this command to specify where the summary should be inserted.

Customizing Your Experience

Access your dashboard to:

• Enable or disable review features such as the Sourcery-generated pull request
  summary, the reviewer's guide, and others.
• Change the review language.
• Add, remove or edit custom review instructions.
• Adjust other review settings.

Getting Help

• Contact our support team for questions or feedback.
• Visit our documentation for detailed guides and information.
• Keep in touch with the Sourcery team by following us on X/Twitter, LinkedIn or GitHub.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (04c56cc) to head (3c9b7dd).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main     #4958   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          629       629           
  Lines        28096     28096           
  Branches      4035      4035           
=========================================
  Hits         28096     28096           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.