message: docs: update the copyright notice date
  PR Close
diff: The MIT License
  -Copyright (c) 2010-2020 Google LLC. https://angular.io/license
  +Copyright (c) 2010-2021 Google LLC. https://angular.io/license
  Permission is hereby granted, free of charge, to any person obtaining a copy
  of this software and associated documentation files (the "Software"), to deal
  