Add reminder to delete block after 1 year.

Author: lukesampson

lib/shortcuts.ps1

@@ -43,6 +43,12 @@ function rm_startmenu_shortcuts($manifest, $global, $arch) {
              Remove-Item $shortcut
         }
         # Before issue 1514 Startmenu shortcut removal
+        #
+        # Shortcuts that should have been installed globally would
+        # have been installed locally up until 27 June 2017.
+        #
+        # TODO: Fairly safe to remove this 'if' block and comment after
+        #       27 June 2018.
         if($global) {
             $shortcut = "$(shortcut_folder $false)\$name.lnk"
             if(Test-Path -Path $shortcut) {