doc: update cpu-checker instructions in qemu doc
Clarify that ``cpu-checker`` is the package that you install to get the
``kvm-ok`` tool used in these instructions.
@@ -23,9 +23,15 @@ Prerequisites
1. Make sure the platform supports Intel VMX as well as VT-d
technologies. On Ubuntu 20.04, this
- can be checked by installing the ``cpu-checker`` tool. If the
- output displays **KVM acceleration can be used**,
- the platform supports it.
+ can be checked by installing the ``kvm-ok`` tool found in the ``cpu-checker`` package.
+
+
+ .. code-block:: bash
+
+ sudo apt install cpu-checker
+
+ Run the ``kvm-ok`` tool and If the output displays **KVM acceleration can be used**,
+ the platform supports Intel VMX and VT-d technologies.
.. code-block:: console
