doc(PopoverDropdownBase): update CustomClass documentation

[ArgoZhang]

Link issues

fixes #8259

Summary By Copilot

Regression?

• Yes
• No

Risk

• High
• Medium
• Low

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 PopoverDropdownBase CustomClass XML documentation in both Chinese and English to explain its implementation via data-bs-custom-class.

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Clarifies the documentation for the PopoverDropdownBase CustomClass parameter by explicitly stating that it is implemented via the Bootstrap data-bs-custom-class attribute, in both Chinese and English XML comments.

File-Level Changes

Change	Details	Files
Clarified how the CustomClass parameter is implemented in PopoverDropdownBase XML documentation comments.	Updated the Chinese XML documentation to mention that CustomClass is implemented via data-bs-custom-class while keeping default value description. Updated the English XML documentation to mention that CustomClass is implemented via data-bs-custom-class while keeping default value description. Removed the separate remarks tag and merged its information into the main summary comments.	src/BootstrapBlazor/Components/DateTimePicker/PopoverDropdownBase.cs

Assessment against linked issues

Issue	Objective	Addressed	Explanation
#8259	Update the PopoverDropdownBase.CustomClass property documentation to clearly describe how the custom class is applied/implemented.	✅

Possibly linked issues

• doc(PopoverDropdownBase): update CustomClass documentation #8259: The PR updates PopoverDropdownBase CustomClass XML docs exactly as requested by the documentation issue.

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[sourcery-ai]

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (a1b5d20) to head (1b349ab).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main     #8260   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          769       769           
  Lines        34436     34436           
=========================================
  Hits         34436     34436           

Flag	Coverage Δ
BB	100.00% <ø> (?)

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