Document .NET 11 ConstructorInfo.GetGenericArguments behavior change (#12616)

* Fix MethodBase.GetGenericArguments docs for .NET 11 ConstructorInfo behavior

MethodBase.GetGenericArguments docs claim that the method throws NotSupportedException when invoked on a ConstructorInfo. As of .NET 11, ConstructorInfo overrides this method to return an empty array (dotnet/runtime commit 6f0b75bf277, fixes #128041).

Update the remarks and exception text to describe both behaviors: .NET Framework and .NET 5-10 throw on a ConstructorInfo; .NET 11+ returns an empty array.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

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Co-authored-by: Jan Kotas <jkotas@microsoft.com>

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Co-authored-by: Max Charlamb <maxcharlamb@microsoft.com>
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
Co-authored-by: Jan Kotas <jkotas@microsoft.com>

Author: 4 people

xml/System.Reflection/MethodBase.xml

@@ -506,13 +506,13 @@
 
 - If the current method is an open constructed method (that is, the <xref:System.Reflection.MethodBase.ContainsGenericParameters> property returns `true`) in which specific types have been assigned to some type parameters and type parameters of enclosing generic types have been assigned to other type parameters, the array contains both types and type parameters. Use the <xref:System.Type.IsGenericParameter> property to tell them apart. For a demonstration of this scenario, see the code example provided for the <xref:System.Reflection.MethodBase.ContainsGenericParameters> property.
 
- Generic constructors are not supported in the .NET Framework version 2.0. This property throws <xref:System.NotSupportedException> if not overridden in a derived class, so an exception is thrown if the current instance is of type <xref:System.Reflection.ConstructorInfo>.
+- If the current method is a constructor, the returned array is an empty array in .NET 11 and later. In .NET 10 and earlier versions, the <xref:System.Reflection.MethodBase.GetGenericArguments*> method throws <xref:System.NotSupportedException>.
 
  For a list of the invariant conditions for terms specific to generic methods, see the <xref:System.Reflection.MethodBase.IsGenericMethod> property. For a list of the invariant conditions for other terms used in generic reflection, see the <xref:System.Type.IsGenericType?displayProperty=nameWithType> property.
 
  ]]></format>
         </remarks>
-        <exception cref="T:System.NotSupportedException">The current object is a <see cref="T:System.Reflection.ConstructorInfo" />. Generic constructors are not supported in the .NET Framework version 2.0. This exception is the default behavior if this method is not overridden in a derived class.</exception>
+        <exception cref="T:System.NotSupportedException">This method is not overridden in a derived class.</exception>
         <altmember cref="P:System.Reflection.MethodBase.IsGenericMethodDefinition" />
         <altmember cref="M:System.Reflection.MethodInfo.GetGenericArguments" />
         <altmember cref="P:System.Reflection.MethodBase.IsGenericMethod" />