Add language slugs (Security, Threading, Reflection, Runtime)

[gewarren]

Prep for dotnet/docs#45892.

(Hide whitespace changes.)

[learn-build-service-prod]

Learn Build status updates of commit 6464ff4:

✅ Validation status: passed

File	Status	Preview URL	Details
xml/System.Reflection.Metadata/MetadataStringComparer.xml	✅Succeeded	View
xml/System.Reflection/AssemblyName.xml	✅Succeeded	View
xml/System.Reflection/AssemblyVersionAttribute.xml	✅Succeeded	View
xml/System.Reflection/EventInfo.xml	✅Succeeded	View
xml/System.Reflection/MethodInfo.xml	✅Succeeded	View
xml/System.Runtime.CompilerServices/Unsafe.xml	✅Succeeded	View
xml/System.Runtime.DurableInstancing/InstancePersistenceContext.xml	✅Succeeded	View
xml/System.Runtime.InteropServices.WindowsRuntime/ReturnValueNameAttribute.xml	✅Succeeded	View
xml/System.Runtime.Serialization/DataContractSerializer.xml	✅Succeeded	View
xml/System.Security.Claims/Claim.xml	✅Succeeded	View
xml/System.Security.Claims/ClaimsAuthorizationManager.xml	✅Succeeded	View
xml/System.Security.Cryptography.X509Certificates/X500DistinguishedNameBuilder.xml	✅Succeeded	View
xml/System.Security.Cryptography.Xml/CipherReference.xml	✅Succeeded	View
xml/System.Security.Cryptography/RSA.xml	✅Succeeded	View
xml/System.Security.Principal/WindowsIdentity.xml	✅Succeeded	View
xml/System.Threading.Tasks/Task.xml	✅Succeeded	View
xml/System.Threading/SemaphoreSlim.xml	✅Succeeded	View

For more details, please refer to the build report.

For any questions, please:

• Try searching the learn.microsoft.com contributor guides
• Post your question in the Learn support channel

[BillWagner]

This LGTM @gewarren

Let's

[learn-build-service-prod]

Learn Build status updates of commit e17b265:

✅ Validation status: passed

File	Status	Preview URL	Details
xml/System.Reflection.Metadata/MetadataStringComparer.xml	✅Succeeded	View
xml/System.Reflection/AssemblyName.xml	✅Succeeded	View
xml/System.Reflection/AssemblyVersionAttribute.xml	✅Succeeded	View
xml/System.Reflection/EventInfo.xml	✅Succeeded	View
xml/System.Reflection/MethodInfo.xml	✅Succeeded	View
xml/System.Runtime.CompilerServices/Unsafe.xml	✅Succeeded	View
xml/System.Runtime.DurableInstancing/InstancePersistenceContext.xml	✅Succeeded	View
xml/System.Runtime.InteropServices.WindowsRuntime/ReturnValueNameAttribute.xml	✅Succeeded	View
xml/System.Runtime.Serialization/DataContractSerializer.xml	✅Succeeded	View
xml/System.Security.Claims/Claim.xml	✅Succeeded	View
xml/System.Security.Claims/ClaimsAuthorizationManager.xml	✅Succeeded	View
xml/System.Security.Cryptography.X509Certificates/X500DistinguishedNameBuilder.xml	✅Succeeded	View
xml/System.Security.Cryptography.Xml/CipherReference.xml	✅Succeeded	View
xml/System.Security.Cryptography/RSA.xml	✅Succeeded	View
xml/System.Security.Principal/WindowsIdentity.xml	✅Succeeded	View
xml/System.Threading.Tasks/Task.xml	✅Succeeded	View
xml/System.Threading/SemaphoreSlim.xml	✅Succeeded	View

For more details, please refer to the build report.

For any questions, please:

• Try searching the learn.microsoft.com contributor guides
• Post your question in the Learn support channel