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docs: pm: Add introduction section in system pm

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Create a introduction section just like the others chapters.

Signed-off-by: Flavio Ceolin <flavio.ceolin@intel.com>
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Flavio Ceolin 2024-04-20 22:44:26 -07:00 • committed by Alberto Escolar
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doc/services/pm/system.rst
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@ -3,6 +3,9 @@
System Power Management
#######################
Introduction
************
The kernel enters the idle state when it has nothing to schedule.
Enabling :kconfig:option:`CONFIG_PM` allows the kernel to call upon the
power management subsystem to put an idle system into one of the supported power states.