Better description for nullableReferenceAttributes

XmlSchemaClassGenerator.Console/Program.cs

@@ -128,7 +128,7 @@ A file name may be given by appending a pipe sign (|) followed by a file name (l
  { "un|uniqueTypeNames", "generate type names that are unique across namespaces (default is false)", v => uniqueTypeNamesAcrossNamespaces = v != null },
  { "gc|generatedCodeAttribute", "add version information to GeneratedCodeAttribute (default is true)", v => createGeneratedCodeAttributeVersion = v != null },
  { "nc|netCore", "generate .NET Core specific code that might not work with .NET Framework (default is false)", v => netCoreSpecificCode = v != null },
- { "nr|nullableReferenceAttributes", "generate attributes for nullable references (default is false)", v => nullableReferenceAttributes = v != null },
+ { "nr|nullableReferenceAttributes", "generate attributes for nullable reference types (default is false)", v => nullableReferenceAttributes = v != null },
  { "ca|commandArgs", "generate a comment with the exact command line arguments that were used to generate the source code (default is true)", v => generateCommandLineArgs = v != null },
  };