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Fix a typo and remove Xr's to vn(4) and vnconfig(4)

Description

Fix a typo and remove Xr's to vn(4) and vnconfig(4)

"mandoc -Tlint" complained about the Xr to vnconfig, which was removed in
r238202. I am not sure but maybe it's time to do the same to vn(4).

MFC after: 2 weeks

Details

Provenance
0mpAuthored on
Parents
rS367418: pkgbase: Remove %VCS_REVISION% from utilities comments
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