11622 clean up rarer mandoc lint warnings

*** 10,29 ****
  .\"  http://www.illumos.org/license/CDDL.
  .TH EPOLL_CTL 3C "April 9, 2016"
  .SH NAME
  epoll_ctl \- control an epoll instance
  .SH SYNOPSIS
- 
- .LP
  .nf
  #include <sys/epoll.h>
  
  \fBint\fR \fBepoll_ctl\fR(\fBint\fR \fIepfd\fR, \fBint\fR \fIop\fR, \fBint\fR \fIfd\fR, \fBstruct epoll_event *\fR\fIevent\fR);
  .fi
  
  .SH DESCRIPTION
- .LP
  The \fBepoll_ctl()\fR function executes the operation specified by
  \fIop\fR (as parameterized by \fIevent\fR) on the \fIepfd\fR epoll instance.
  Valid values for \fIop\fR:
  
  .sp
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  potential failure modes for user-level software and should be used
  with caution.
  .RE
  
  .SH RETURN VALUES
- .LP
  Upon successful completion, \fBepoll_ctl()\fR returns 0.
  If an error occurs, -1 is returned and errno is set to indicate
  the error.
  
  .SH ERRORS
- .LP
  \fBepoll_ctl()\fR will fail if:
  .sp
  .ne 2
  .na
  \fB\fBEBADF\fR\fR
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  specified \fBepoll\fR(5) instance.
  .RE
  
  .sp
  .SH NOTES
- .LP
- 
  The \fBepoll\fR(5) facility is implemented for purposes of offering
  compatibility for Linux-borne applications; native
  applications should continue to prefer using event ports via the
  \fBport_create\fR(3C), \fBport_associate\fR(3C) and \fBport_get\fR(3C)
  interfaces.  See \fBepoll\fR(5) for compatibility details and restrictions.
  
  .SH SEE ALSO
- .LP
  \fBepoll_create\fR(3C), \fBepoll_wait\fR(3C),
  \fBport_create\fR(3C), \fBport_associate\fR(3C), \fBport_get\fR(3C),
  \fBepoll\fR(5)
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