Mateusz Piotrowski 76d2af50b5 Document how to use sudo for SU_CMD
It is rather common for the ports users to replace su(1) with sudo(8)
within the SU_CMD variable. Let's document it in the manual page (so far
it's been hidden in a comment within bsd.commands.mk).

MFC after:	2 weeks
2020-11-01 17:27:48 +00:00
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