Add blank line to arch-update man page

doc/man/arch-update.1

@@ -23,6 +23,7 @@ An update notifier/applier for Arch Linux that assists you with important pre/po
 .RB "It also checks for orphan packages, unused Flatpak packages, old and/or uninstalled cached packages in pacman's cache, pacnew/pacsave files and pending kernel update requiring a reboot to be applied and, if there are, offers to process them."
 .br
 .RB "Those functions are launched when you click on the (.desktop) icon."
+
 .PP
 
 .TP