.bash/commands: remove obsolete MacPorts override

"Obsolete" beceause I no longer use MacPorts. And neither should you.
.bash/commands: whenis: fix bogus subshell comment
Merge branch 'master' of git://github.com/janmoesen/tilde

* 'master' of git://github.com/janmoesen/tilde:
  .bash/commands: whenis: fix bogus subshell comment
  .bash/commands: remove obsolete MacPorts override