Blazor old content alert

[guardrex]

Addresses #28001

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aspnetcore/blazor/advanced-scenarios.md	aspnetcore/blazor/advanced-scenarios
aspnetcore/blazor/blazor-server-ef-core.md	aspnetcore/blazor/blazor-server-ef-core
aspnetcore/blazor/call-web-api.md	aspnetcore/blazor/call-web-api
aspnetcore/blazor/components/built-in-components.md	aspnetcore/blazor/components/built-in-components
aspnetcore/blazor/components/cascading-values-and-parameters.md	aspnetcore/blazor/components/cascading-values-and-parameters
aspnetcore/blazor/components/class-libraries.md	aspnetcore/blazor/components/class-libraries
aspnetcore/blazor/components/control-head-content.md	aspnetcore/blazor/components/control-head-content
aspnetcore/blazor/components/css-isolation.md	aspnetcore/blazor/components/css-isolation
aspnetcore/blazor/components/data-binding.md	aspnetcore/blazor/components/data-binding
aspnetcore/blazor/components/dynamiccomponent.md	aspnetcore/blazor/components/dynamiccomponent
aspnetcore/blazor/components/event-handling.md	aspnetcore/blazor/components/event-handling
aspnetcore/blazor/components/index.md	aspnetcore/blazor/components/index
aspnetcore/blazor/components/js-spa-frameworks.md	aspnetcore/blazor/components/js-spa-frameworks
aspnetcore/blazor/components/layouts.md	aspnetcore/blazor/components/layouts
aspnetcore/blazor/components/lifecycle.md	aspnetcore/blazor/components/lifecycle
aspnetcore/blazor/components/prerendering-and-integration.md	aspnetcore/blazor/components/prerendering-and-integration
aspnetcore/blazor/components/rendering.md	aspnetcore/blazor/components/rendering
aspnetcore/blazor/components/templated-components.md	aspnetcore/blazor/components/templated-components
aspnetcore/blazor/components/virtualization.md	aspnetcore/blazor/components/virtualization
aspnetcore/blazor/debug.md	aspnetcore/blazor/debug
aspnetcore/blazor/file-downloads.md	aspnetcore/blazor/file-downloads
aspnetcore/blazor/file-uploads.md	aspnetcore/blazor/file-uploads
aspnetcore/blazor/forms-and-input-components.md	aspnetcore/blazor/forms-and-input-components
aspnetcore/blazor/fundamentals/configuration.md	aspnetcore/blazor/fundamentals/configuration
aspnetcore/blazor/fundamentals/dependency-injection.md	aspnetcore/blazor/fundamentals/dependency-injection
aspnetcore/blazor/fundamentals/environments.md	aspnetcore/blazor/fundamentals/environments
aspnetcore/blazor/fundamentals/handle-errors.md	aspnetcore/blazor/fundamentals/handle-errors
aspnetcore/blazor/fundamentals/index.md	aspnetcore/blazor/fundamentals/index
aspnetcore/blazor/fundamentals/logging.md	aspnetcore/blazor/fundamentals/logging
aspnetcore/blazor/fundamentals/routing.md	aspnetcore/blazor/fundamentals/routing

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