Fix inaccurate tutorial on listing
Fix inaccurate tutorial on listing

The documentation is inaccurate with regards to partial matches.
bpftrace does not support partial matches, as can be seen with the
fully anchored regex:

https://github.com/iovisor/bpftrace/blob/master/src/list.cpp#L118-L128

iovisor/bpftrace,iovisor/bpftrace,iovisor/bpftrace,iovisor/bpftrace