Update suppression reason for Assembly.GetType call (#105577)

With #104060 there will be
trim warnings whenever a non-qualified type name is used with
this API, so the call to `_type.AssemblyGetType` is effectively
unreachable in a trimmed app with no trim warnings and it is safe
to suppress.

Author: sbomer

src/libraries/System.ComponentModel.TypeConverter/src/System/ComponentModel/ReflectTypeDescriptionProvider.ReflectedTypeData.cs

@@ -509,7 +509,7 @@ internal PropertyDescriptorCollection GetProperties()
             /// then a global Type.GetType is performed.
             /// </summary>
             [UnconditionalSuppressMessage("ReflectionAnalysis", "IL2026:RequiresUnreferencedCode",
-                Justification = "Calling _type.Assembly.GetType on a non-assembly qualified type will still work. See https://github.com/mono/linker/issues/1895")]
+                Justification = "Trimming requires fully-qualified type names for strings annotated with DynamicallyAccessedMembers, so the call to _type.Assembly.GetType should be unreachable in an app without trim warnings.")]
             [UnconditionalSuppressMessage("ReflectionAnalysis", "IL2057:TypeGetType",
                 Justification = "Using the non-assembly qualified type name will still work.")]
             private Type? GetTypeFromName(