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pci(8): document vid/did argument

--- a/sys/man/8/pci

+++ b/sys/man/8/pci

@@ -32,6 +32,14 @@

 option adds a second line per device, containing an English description

 obtained from

 .BR /lib/pci .

+.PP

+If any number of 

+.B vid/did

+pairs is specified,

+.I pci

+instead looks up each pair in the database and prints the

+.B vid/did,

+followed by the English description of the vendor and device on a new line if it exists in the database.

 .SH FILES

 .B /lib/pci

 .SH SOURCE