git: devname.3: Add a little example

[Aaron LI]

commit e73439e7d8b66e3326ad3a8caee9573192891ab8
Author: Aaron LI <aly at aaronly.me>
Date:   Fri Jan 1 15:04:37 2021 +0800

    devname.3: Add a little example
    
    Obtained from FreeBSD but with some updates.

Summary of changes:
 lib/libc/gen/devname.3 | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

http://gitweb.dragonflybsd.org/dragonfly.git/commitdiff/e73439e7d8b66e3326ad3a8caee9573192891ab8


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