Documentation: PM: amd-pstate: add guided mode to the Operation mode

the guided mode is also supported, so the operation mode should include
that mode as well.

Reviewed-by: Mario Limonciello <mario.limonciello@amd.com>
Signed-off-by: Perry Yuan <perry.yuan@amd.com>
Reviewed-by: Gautham R. Shenoy <gautham.shenoy@amd.com>
Link: https://lore.kernel.org/r/a61d825ef71f6aacc8f1624fe9fb982b8446b5a7.1718811234.git.perry.yuan@amd.com


Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>