bcc/tools: fix typo in help message
bcc/tools: fix typo in help message

brendangregg/bcc,tuxology/bcc,tuxology/bcc,brendangregg/bcc,iovisor/bcc,iovisor/bcc,iovisor/bcc,brendangregg/bcc,tuxology/bcc,brendangregg/bcc,tuxology/bcc,iovisor/bcc,tuxology/bcc,brendangregg/bcc,iovisor/bcc