OpenBSD / src / zXnlxZt / explain in a simpler way when the default is -r and when it is -s;

OpenBSD/src zXnlxZt — usr.sbin/sysupgrade sysupgrade.8

   explain in a simpler way when the default is -r and when it is -s;
   triggered by a very different patch from Rashad Kanavath;
   OK florian@

Version	Delta		File
1.9	+4	-10	usr.sbin/sysupgrade/sysupgrade.8
	+4	-10	1 files