usr/src/man1m/dispadmin.1m: Fix bold around FX

*** 46,56 ****
  .sp .6
  .RS 4n
  Specifies the class whose parameters are to be displayed or changed. Valid
  \fIclass\fR values are: \fBRT\fR for the real-time class, \fBTS\fR for the
  time-sharing class, \fBIA\fR for the inter-active class, \fBFSS\fR for the
! fair-share class, and FX for the fixed-priority class. The time-sharing and
  inter-active classes share the same scheduler, so changes to the scheduling
  parameters of one will change those of the other.
  .RE
  
  .sp
--- 46,56 ----
  .sp .6
  .RS 4n
  Specifies the class whose parameters are to be displayed or changed. Valid
  \fIclass\fR values are: \fBRT\fR for the real-time class, \fBTS\fR for the
  time-sharing class, \fBIA\fR for the inter-active class, \fBFSS\fR for the
! fair-share class, and \fBFX\fR for the fixed-priority class. The time-sharing and
  inter-active classes share the same scheduler, so changes to the scheduling
  parameters of one will change those of the other.
  .RE
  
  .sp