Documentation: amd-pstate:fix minimum performance state label error

Documentation: amd-pstate:fix minimum performance state label error

In the AMD P-States Performance Scale diagram, the labels for "Max Perf"
and "Lowest Perf" were incorrectly used to define the range for
"Desired Perf".The "Desired performance target" should be bounded by the
"Maximum requested performance" and the "Minimum requested performance",
which corresponds to "Max Perf" and "Min Perf", respectively.

Signed-off-by: Shouye Liu <shouyeliu@tencent.com>
Reviewed-by: Mario Limonciello <mario.limonciello@amd.com>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Link: https://lore.kernel.org/r/20250620021658.92161-1-shouyeliu@gmail.com