Use ".Nm fsck_ffs", so that this turns up in whatis(1), and others. Add .Xr to fsck.
Use ".Nm fsck_ffs", so that this turns up in whatis(1), and others.
Add .Xr to fsck.

Prompted by:	JM Jr's script that shows binaries with no whatis info
Reviewed by:	adrian

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