Add some Supported Unsupported attributes (#52015)

src/libraries/System.DirectoryServices.Protocols/ref/System.DirectoryServices.Protocols.cs

@@ -372,6 +372,7 @@ public partial class LdapSessionOptions
         public bool RootDseCache { get { throw null; } set { } }
         public string SaslMethod { get { throw null; } set { } }
         public bool Sealing { get { throw null; } set { } }
+        [System.Runtime.Versioning.SupportedOSPlatformAttribute("windows")]
         public bool SecureSocketLayer { get { throw null; } set { } }
         public object SecurityContext { get { throw null; } }
         public System.TimeSpan SendTimeout { get { throw null; } set { } }

src/libraries/System.DirectoryServices.Protocols/src/System/DirectoryServices/Protocols/ldap/LdapSessionOptions.Linux.cs

 // Licensed to the .NET Foundation under one or more agreements.
 // The .NET Foundation licenses this file to you under the MIT license.
 
+using System.Runtime.Versioning;
+
 namespace System.DirectoryServices.Protocols
 {
     public partial class LdapSessionOptions
     {
         private static void PALCertFreeCRLContext(IntPtr certPtr) { /* No op */ }
 
+        [SupportedOSPlatform("windows")]
         public bool SecureSocketLayer
         {
             get => throw new PlatformNotSupportedException();

src/libraries/System.DirectoryServices.Protocols/src/System/DirectoryServices/Protocols/ldap/LdapSessionOptions.Windows.cs

 // Licensed to the .NET Foundation under one or more agreements.
 // The .NET Foundation licenses this file to you under the MIT license.
 
+using System.Runtime.Versioning;
+
 namespace System.DirectoryServices.Protocols
 {
     public partial class LdapSessionOptions
     {
         private static void PALCertFreeCRLContext(IntPtr certPtr) => Interop.Ldap.CertFreeCRLContext(certPtr);
 
+        [SupportedOSPlatform("windows")]
         public bool SecureSocketLayer
         {
             get

src/libraries/System.Private.CoreLib/src/System/Text/NormalizationForm.cs

 // Licensed to the .NET Foundation under one or more agreements.
 // The .NET Foundation licenses this file to you under the MIT license.
 
+using System.Runtime.Versioning;
+
 namespace System.Text
 {
     public enum NormalizationForm
     {
         FormC = 1,
         FormD = 2,
+        [UnsupportedOSPlatform("browser")]
         FormKC = 5,
+        [UnsupportedOSPlatform("browser")]
         FormKD = 6
     }
 }

src/libraries/System.Runtime/ref/System.Runtime.cs

@@ -10969,7 +10969,9 @@ public enum NormalizationForm
     {
         FormC = 1,
         FormD = 2,
+        [System.Runtime.Versioning.UnsupportedOSPlatform("browser")]
         FormKC = 5,
+        [System.Runtime.Versioning.UnsupportedOSPlatform("browser")]
         FormKD = 6,
     }
     public readonly partial struct Rune : System.IComparable, System.IComparable<System.Text.Rune>, System.IEquatable<System.Text.Rune>, System.ISpanFormattable