* Add missing `utility' word to sentence describing
ips(4) card configuration.
* Remove extraneous use of .Pp, and describe the tunable
hw.ips.0.disable in a better way.
* Replace wrongly used .Op mdoc macros with the .Bq macro.
The .Op macro should only be used when describing a
``usage'' line of a utility/command.
* Add .Er, for marking errno defines (ENOMEM etc etc)