Update obsolete file name bitesize -> bitehist
Update obsolete file name bitesize -> bitehist

Update tutorial to change the file name.
iovisor/bcc,tuxology/bcc,iovisor/bcc,mcaleavya/bcc,mcaleavya/bcc,mcaleavya/bcc,iovisor/bcc,brendangregg/bcc,brendangregg/bcc,mcaleavya/bcc,tuxology/bcc,iovisor/bcc,mcaleavya/bcc,brendangregg/bcc,tuxology/bcc,iovisor/bcc,tuxology/bcc,brendangregg/bcc,tuxology/bcc,brendangregg/bcc