o Refer to hw.ata.wc as a 'loader tunable' rather than a 'kernel variable'   for consistency with the rest of the document.  Since we've already   described the properties of loader tunables elsewhere, remove the   duplicate description of it being a boot-time property.
o Refer to hw.ata.wc as a 'loader tunable' rather than a 'kernel variable'
  for consistency with the rest of the document.  Since we've already
  described the properties of loader tunables elsewhere, remove the
  duplicate description of it being a boot-time property.

MFC after:	3 days

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