📄 docs: Update SharePoint configuration link for File Uploads section

Replaced the link for File Upload Configuration in the SharePoint documentation to point to the new location in the LibreChat YAML structure.

Author: danny-avila

pages/docs/configuration/sharepoint.mdx

@@ -273,4 +273,4 @@ If your organization uses Information Barriers:
 - [Azure Entra Authentication](/docs/configuration/authentication/OAuth2-OIDC/azure)
 - [OpenID Token Reuse](/docs/configuration/authentication/OAuth2-OIDC/token-reuse)
 - [Microsoft Graph API Integration](/docs/configuration/authentication/OAuth2-OIDC/azure#advanced-microsoft-graph-api-integration)
-- [File Upload Configuration](/docs/configuration/file_uploads)
+- [File Upload Configuration](/docs/configuration/librechat_yaml/object_structure/file_config)