Documentation: power: fix pm_qos_interface.rst format warning

Fix Sphinx warnings by indenting the bullet list (and making it
unnumbered).

Documentation/power/pm_qos_interface.rst:12: WARNING: Unexpected indentation.

Signed-off-by: Randy Dunlap <[e-mail]>
Signed-off-by: Rafael J. Wysocki <[e-mail]>

Documentation/power/pm_qos_interface.rst

···
 one of the parameters.
 
 Two different PM QoS frameworks are available:
-1. CPU latency QoS.
-2. The per-device PM QoS framework provides the API to manage the
+ * CPU latency QoS.
+ * The per-device PM QoS framework provides the API to manage the
    per-device latency constraints and PM QoS flags.
 
 The latency unit used in the PM QoS framework is the microsecond (usec).