[Network] Fix binding mistake in NWConnection. (#21174)

The 'nw_connection_set_viability_changed_handler' P/Invoke was originally
bound as 'SetBooleanChangeHandler', which isn't quite right.

So now bind it as 'SetViabilityChangeHandler', obsolete the old version and
remove it in XAMCORE_5_0.

src/Network/NWConnection.cs

@@ -9,6 +9,7 @@
 #nullable enable
 
 using System;
+using System.ComponentModel;
 using System.Runtime.InteropServices;
 using ObjCRuntime;
 using Foundation;
@@ -157,8 +158,20 @@ namespace Network {
 		[DllImport (Constants.NetworkLibrary)]
 		static extern unsafe void nw_connection_set_viability_changed_handler (IntPtr handle, void* callback);
 
+#if !XAMCORE_5_0
+		[Obsolete ("Use 'SetViabilityChangeHandler' instead.")]
+		[EditorBrowsable (EditorBrowsableState.Never)]
 		[BindingImpl (BindingImplOptions.Optimizable)]
 		public unsafe void SetBooleanChangeHandler (Action<bool> callback)
+		{
+			SetViabilityChangeHandler (callback);
+		}
+#endif // !XAMCORE_5_0
+
+		/// <summary>Set a handler that is called when data can be sent or received.</summary>
+		/// <param name="callback">The callback to call when data can be sent or received.</param>
+		[BindingImpl (BindingImplOptions.Optimizable)]
+		public unsafe void SetViabilityChangeHandler (Action<bool> callback)
 		{
 			if (callback is null) {
 				nw_connection_set_viability_changed_handler (GetCheckedHandle (), null);

tests/cecil-tests/Documentation.KnownFailures.txt

@@ -42193,7 +42193,6 @@ M:Network.NWConnection.Send(System.Byte[],System.Int32,System.Int32,Network.NWCo
 M:Network.NWConnection.SendIdempotent(CoreFoundation.DispatchData,Network.NWContentContext,System.Boolean)
 M:Network.NWConnection.SendIdempotent(System.Byte[],Network.NWContentContext,System.Boolean)
 M:Network.NWConnection.SetBetterPathAvailableHandler(System.Action{System.Boolean})
-M:Network.NWConnection.SetBooleanChangeHandler(System.Action{System.Boolean})
 M:Network.NWConnection.SetPathChangedHandler(System.Action{Network.NWPath})
 M:Network.NWConnection.SetQueue(CoreFoundation.DispatchQueue)
 M:Network.NWConnection.SetStateChangeHandler(System.Action{Network.NWConnectionState,Network.NWError})