Doc-fix for PowerPC CPU model driver
Doc-fix for PowerPC CPU model driver

There are some descriptions not right in PowerPC CPU model driver.
This patch is to fix them.

Signed-off-by: Li Zhang <63d1e54bd8032f9fe1aee582998ae5c623006e3c@linux.vnet.ibm.com>
Acked-by: Michal Privoznik <83d82aaba2eed257f4814b0c239c260c4caaadf0@redhat.com>

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