Fix a minor defect in the manual for Trusted Compute Pools

The command used as a sample in the manual to set a flavor is not correct in Juno.

Closes-Bug: 1362899
Change-Id: I89b4aa6d3de67d300769cda1d7c9847a5a34ad2b
Signed-off-by: Dave Chen <wei.d.chen@intel.com>
Merge "Fix a minor defect in the manual for Trusted Compute Pools"