[develop] Fix: Small fix corrections across multiple pages (3)

[qiutongMS]

Summary

• fix small documentation/code-sample issues across 10 develop pages
• correct code snippets for dialogs, dependency properties, Cosmos DB, navigation, passkeys, and other sample issues
• clean up smart card prerequisites and a malformed code block

[qiutongMS]

Review Result: APPROVED

Summary

All 10 changes are technically correct and improve documentation quality. Fixes include a logic bug (rowcount vs colcount), a JavaScript class-name error (Uint8Array), a C# lambda syntax error, a missing
eturn false\ statement, correct API usage patterns, and important modifier additions (\public static readonly\ on DependencyProperty). No must-fix issues were identified.

Must-Fix Issues

None.

Suggestions

#	File	Line/Section	Suggestion	Severity
1	hub/apps/develop/security/use-cases.md	navigator.credentials.get code block	After fixing \UInt8Array → Uint8Array, the \id\ field indentation dropped to 5 spaces while \ ype\ stays at 6 spaces in the same object literal — minor inconsistency worth aligning	suggestion
2	hub/apps/develop/security/smart-cards.md	"Create a virtual smart card" section	Prerequisite was demoted from a >[!NOTE]\ callout to plain prose; consider using > [!IMPORTANT]\ or > [!NOTE]\ to preserve reader visibility	suggestion
3	hub/apps/develop/ui/controls/rich-edit-box.md	SaveButton_Click handler	New \ContentDialog\ (like the existing open-error dialog) omits the \XamlRoot\ property assignment required by WinUI 3 — both dialogs would throw at runtime; pre-existing issue, but worth a follow-up fix for both handlers	suggestion

Page Health Assessment

File	Overall Quality	Notes
hub/apps/design/layout/boxpanel-example-custom-panel.md	✅ Good	Logic bug (rowcount vs colcount) correctly fixed
hub/apps/develop/composition/source-modifiers.md	✅ Good	Plain prose inside code block correctly converted to C# comment
hub/apps/develop/data-access/cosmos-db-data-access.md	✅ Good	Explicit ContainerResponse two-step pattern is clearer for learners
hub/apps/develop/security/share-certificates.md	✅ Good	Grammar fix and missing \
eturn false\ both correct
hub/apps/develop/security/smart-cards.md	✅ Good	Stray }\ correctly removed; prerequisite repositioned logically before steps
hub/apps/develop/security/use-cases.md	✅ Good	Missing opening quote and wrong JS class name (UInt8Array→Uint8Array) both fixed
hub/apps/develop/security/windows-hello-auth-service.md	✅ Good	Lambda operator syntax error (\ = >\ → \ =>) correctly fixed
hub/apps/develop/ui/controls/rich-edit-box.md	✅ Good	MessageDialog correctly replaced with ContentDialog (WinUI 3 pattern)
hub/apps/develop/ui/navigation/navigate-between-two-pages.md	✅ Good	Class name corrected from MainPage to Page2 for the back-navigation handler
hub/apps/winui/winui3/xaml-templated-controls-winui-3.md	✅ Good	\public static readonly\ modifiers are required for DependencyProperty — important correctness fix