Improve binding data type explicitly null message

Author: simonrozsival

src/Controls/src/Build.Tasks/BuildException.cs

@@ -56,7 +56,7 @@ class BuildExceptionCode
 		public static BuildExceptionCode BPName = new BuildExceptionCode("XFC", 0020, nameof(BPName), "");
 		public static BuildExceptionCode BPMissingGetter = new BuildExceptionCode("XFC", 0021, nameof(BPMissingGetter), "");
 		public static BuildExceptionCode BindingWithoutDataType = new BuildExceptionCode("XC", 0022, nameof(BindingWithoutDataType), "https://learn.microsoft.com/dotnet/maui/fundamentals/data-binding/compiled-bindings"); //warning
-		public static BuildExceptionCode BindingWithNullDataType = new BuildExceptionCode("XC", 0023, nameof(BindingWithNullDataType), ""); //warning
+		public static BuildExceptionCode BindingWithNullDataType = new BuildExceptionCode("XC", 0023, nameof(BindingWithNullDataType), "https://learn.microsoft.com/dotnet/maui/fundamentals/data-binding/compiled-bindings"); //warning
 
 		//Bindings, conversions
 		public static BuildExceptionCode Conversion = new BuildExceptionCode("XFC", 0040, nameof(Conversion), "");

src/Controls/src/Build.Tasks/ErrorMessages.resx

@@ -1,4 +1,4 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?>
 <root>
   <!-- 
     Microsoft ResX Schema 
@@ -139,7 +139,7 @@
     <value>Binding could be compiled to improve runtime performance if x:DataType is specified. See https://learn.microsoft.com/dotnet/maui/fundamentals/data-binding/compiled-bindings for more information.</value>
   </data>  
   <data name="BindingWithNullDataType" xml:space="preserve">
-    <value>Binding could be compiled if x:DataType is not explicitly null.</value>
+    <value>Binding could be compiled to improve runtime performance if x:DataType is not explicitly null. See https://learn.microsoft.com/dotnet/maui/fundamentals/data-binding/compiled-bindings for more information.</value>
   </data>  
   <data name="BindingPropertyNotFound" xml:space="preserve">
     <value>Binding: Property "{0}" not found on "{1}".</value>