usage examples in man bonnie++ don't work

[Karl-Philipp Richter]

The example for multiple processes should read

    bonnie++ -p3
    bonnie++ -y s > out1 & # requires bonnie++ -pN to be run
    bonnie++ -y s > out2 &
    bonnie++ -y s > out3 &

because `bonnie++ -y` doesn't work alone and it's not clear from the example that the commands need to be run in order (although it's clear from the manpage).

ProblemType: Bug
DistroRelease: Ubuntu 15.04
Package: bonnie++ 1.97.1
Uname: Linux 4.0.1-040001-generic x86_64
ApportVersion: 2.17.2-0ubuntu1
Architecture: amd64
CurrentDesktop: Unity
Date: Sun May 3 11:15:48 2015
EcryptfsInUse: Yes
InstallationDate: Installed on 2015-04-02 (30 days ago)
InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Beta amd64 (20150326)
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=de_DE.UTF-8
 SHELL=/bin/bash
SourcePackage: bonnie++
SystemImageInfo:
 current build number: 0
 device name:
 channel: daily
 last update: Unknown
UpgradeStatus: No upgrade log present (probably fresh install)