suggested fix for mkfifo.1

[Ben Calvert]

en:1$ cd /usr/src/sbin/mknod
ben:2$ cvs diff mkfifo.1
Index: mkfifo.1
===================================================================
RCS file: /cvs/src/sbin/mknod/mkfifo.1,v
retrieving revision 1.9
diff -r1.9 mkfifo.1
57c57
< Set the file permission bits of newly created directories to
---
> Set the file permission bits of the newly created fifo to