13438 Update prototypes to 2021

*** 7,17 ****
  .\" A full copy of the text of the CDDL should have accompanied this
  .\" source.  A copy of the CDDL is also available via the Internet at
  .\" http://www.illumos.org/license/CDDL.
  .\"
  .\"
! .\" Copyright 2020 <contributor>
  .\"
  .Dd Month Day, Year
  .Dt COMMAND 1
  .\" Here and in other places "COMMAND" and "command" are place holders
  .\" that should be replaced with the name of the actual command that
--- 7,17 ----
  .\" A full copy of the text of the CDDL should have accompanied this
  .\" source.  A copy of the CDDL is also available via the Internet at
  .\" http://www.illumos.org/license/CDDL.
  .\"
  .\"
! .\" Copyright 2021 <contributor>
  .\"
  .Dd Month Day, Year
  .Dt COMMAND 1
  .\" Here and in other places "COMMAND" and "command" are place holders
  .\" that should be replaced with the name of the actual command that