name collision in sis(4)

[Brett Mahar]

 It seems like sis occurs twice in section 4 of the manual
(amd64-current)

$  man -k sis
....
sis (4) - SiS 900, SiS 7016, and NS DP83815/6 10/100 Ethernet device
sisfb (4/loongson) - SiS 315 Pro frame buffer
....
sis (4) - SiS and XGI video driver