Update driveitem_list_children.md

[icyfire0573]

Fix broken url.
old one took me to https://learn.microsoft.com/en-us/graph/

[learn-build-service-prod]

Learn Build status updates of commit a0eb45b:

⚠️ Validation status: warnings

File	Status	Preview URL	Details
docs/rest-api/api/driveitem_list_children.md	⚠️Warning	View (>= odsp-graph-online)	Details
docs/rest-api/index.md	⚠️Warning	View (>= odsp-graph-online)	Details
docs/sample-code.md	⚠️Warning	View (>= odsp-graph-online)	Details

docs/rest-api/api/driveitem_list_children.md

• Line 105, Column 39: [Warning: hard-coded-locale - See documentation] Link 'https://learn.microsoft.com/en-us/graph/query-parameters' contains locale code 'en-us'. For localizability, remove 'en-us' from links to most Microsoft sites.
• Line 2, Column 1: [Suggestion: description-missing - See documentation] Missing required attribute: 'description'.
• Line 105, Column 39: [Suggestion: docs-link-absolute - See documentation] Absolute link 'https://learn.microsoft.com/en-us/graph/query-parameters' will be broken in isolated environments. Replace with a relative link.

docs/rest-api/index.md

• Line 184, Column 18: [Warning: insecure-link - See documentation] Link 'http://dev.onenote.com' is insecure. Links to Microsoft sites must use 'https' instead of 'http'.
• Line 2, Column 1: [Suggestion: description-missing - See documentation] Missing required attribute: 'description'.
• Line 207, Column 3: [Suggestion: docs-link-absolute - See documentation] Absolute link 'https://docs.microsoft.com/legal/microsoft-apis/terms-of-use' will be broken in isolated environments. Replace with a relative link.

docs/sample-code.md

• Line 2, Column 1: [Warning: title-missing - See documentation] Missing required attribute: 'title'. Add a title string to show in search engine results.
• Line 34, Column 3: [Warning: insecure-link - See documentation] Link 'http://github.com/OneDrive/onedrive-explorer-js' is insecure. Links to Microsoft sites must use 'https' instead of 'http'.
• Line 74, Column 3: [Warning: insecure-link - See documentation] Link 'http://github.com/OneDrive/onedrive-explorer-android' is insecure. Links to Microsoft sites must use 'https' instead of 'http'.
• Line 78, Column 3: [Warning: hard-coded-locale - See documentation] Link 'https://msdn.microsoft.com/EN-US/library/dn833235.aspx' contains locale code 'EN-US'. For localizability, remove 'EN-US' from links to most Microsoft sites.
• Line 2, Column 1: [Suggestion: description-missing - See documentation] Missing required attribute: 'description'.

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