docs: use kernal version distro instead of jewel in the example of run a suite
When try the example of run a suite in README, an error would accur,
complaining that "Kernel branch 'jewel' not found". Use "-k distro" instead.
@@ -103,7 +103,7 @@ where:
For example, consider::
- teuthology-suite -s rbd -c wip-fix -k jewel -e bob.smith@foo.com -f basic -t jewel -m mira
+ teuthology-suite -s rbd -c wip-fix -k distro -e bob.smith@foo.com -f basic -t jewel -m mira
The above command runs the rbd suite using the wip-fix branch of ceph, the
jewel kernel, with a 'basic' kernel flavor, and the teuthology jewel branch
