manpage lint.

*** 39,49 ****
  The \fIflags\fR argument may be used to specify attributes on both file
  descriptors.  \fBpipe2()\fR called with a \fIflags\fR value of 0 will
  behave identically to \fBpipe()\fR.  Values for \fIflags\fR are constructed
  by a bitwise-inclusive-OR of flags from the following list, defined in
  <\fBfcntl.h\fR>.
- .RE
  
  .sp
  .ne 2
  .na
  \fB\fBO_NONBLOCK\fR\fR
--- 39,48 ----