Slight markup fixes.

share/man/man4/esp.4

@@ -101,7 +101,6 @@ and certain types of parallel port hardware.
 As such this driver may eventually replace the
 .Xr amd 4
 driver for network hardware.
-.Pp
 .Sh ERRORS
 The following driver specific error messages
 may be reported:
@@ -129,16 +128,19 @@ core registers.
 .Xr scbus 4 ,
 .Xr camcontrol 8
 .Pp
+.Bl -item -compact
+.It
 .Pa http://www.qlc.com/
-.br
+.It
 .Pa http://www.sun.com/
+.El
 .Sh HISTORY
 The
 .Nm
 driver was written for
 .Nx
 by
-.An Eric S. Hvozda.
+.An Eric S. Hvozda .
 The
 .Nm
 driver was then ported to

share/man/man4/rc.4

@@ -79,7 +79,7 @@ driver was unable to obtain the
 addresses.
 .It Bq Er ENXIO
 May be returned if the device cannot obtain a valid
-.Tn IO
+.Tn I/O
 port through
 .Fn isa_get_port .
 This error may also be returned if the
@@ -90,8 +90,8 @@ function cannot obtain a valid
 .Sh SEE ALSO
 .Xr tty 1 ,
 .Xr ttyname 3 ,
-.Xr tty 4 ,
 .Xr sio 4 ,
+.Xr tty 4 ,
 .Xr device.hints 5 ,
 .Xr comcontrol 8 ,
 .Xr getty 8 ,
@@ -113,7 +113,7 @@ This manual page was written by
 The
 .Nm
 driver code still uses the
-.Fn splx
+.Xr spl 9
 functions.
 These should be replaced by
 .Xr mutex 9