tools: typo fix
tools: typo fix

typo fix in README.developer

Change-Id: I03111047642f1fb0e4d19772c6e5425de11e2d29
Signed-off-by: Laszlo Hornyak <71bc11d003eb8a4052af2e4a579dccca64163578@redhat.com>

walteryang47/ovirt-engine,walteryang47/ovirt-engine,OpenUniversity/ovirt-engine,halober/ovirt-engine,OpenUniversity/ovirt-engine,yapengsong/ovirt-engine,walteryang47/ovirt-engine,yingyun001/ovirt-engine,yapengsong/ovirt-engine,eayun/ovirt-engine,OpenUniversity/ovirt-engine,eayun/ovirt-engine,zerodengxinchao/ovirt-engine,yapengsong/ovirt-engine,walteryang47/ovirt-engine,yingyun001/ovirt-engine,halober/ovirt-engine,eayun/ovirt-engine,halober/ovirt-engine,walteryang47/ovirt-engine,eayun/ovirt-engine,eayun/ovirt-engine,yapengsong/ovirt-engine,zerodengxinchao/ovirt-engine,halober/ovirt-engine,yingyun001/ovirt-engine,yingyun001/ovirt-engine,yapengsong/ovirt-engine,OpenUniversity/ovirt-engine,yingyun001/ovirt-engine,zerodengxinchao/ovirt-engine,zerodengxinchao/ovirt-engine,zerodengxinchao/ovirt-engine,OpenUniversity/ovirt-engine