docs: platform/x86: wmi: mention tool for invoking WMI methods

docs: platform/x86: wmi: mention tool for invoking WMI methods

Add a reference to WMIExplorer, a tool useful for inspecting and
invoking WMI methods on Windows. This can assist developers in testing
and understanding WMI device functionality when porting drivers to
Linux.

Signed-off-by: Hridesh MG <hridesh699@gmail.com>
Reviewed-by: Armin Wolf <W_Armin@gmx.de>
Link: https://lore.kernel.org/r/20250101092730.87160-1-hridesh699@gmail.com
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>