Allow .Rv macro to be used in 7th section also.  This patch will fix  "Usage: .Rv ..." error at mdoc.samples.7
Allow .Rv macro to be used in 7th section also.  This patch
will fix  "Usage: .Rv ..." error at mdoc.samples.7

Ok'ed by:	mpp

jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase