[PATCH -next] PM/sleep: fix doc warnings in main.c

[Baokun Li]

Add description for `state_show` to fix the W=1 warnings:

kernel/power/main.c:593: warning:
 Function parameter or member 'kobj' not described in 'state_show'
kernel/power/main.c:593: warning:
 Function parameter or member 'attr' not described in 'state_show'
kernel/power/main.c:593: warning:
 Function parameter or member 'buf' not described in 'state_show'

Signed-off-by: Baokun Li <libaokun1@xxxxxxxxxx>
---
 kernel/power/main.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/kernel/power/main.c b/kernel/power/main.c
index 12c7e1bb442f..d508c8c582e0 100644
--- a/kernel/power/main.c
+++ b/kernel/power/main.c
@@ -579,7 +579,9 @@ struct kobject *power_kobj;
 
 /**
  * state - control system sleep states.
- *
+ * @kobj: Pointer to the kernel object.
+ * @attr: Pointer to the kernel object attribute.
+ * @buf: buffer.
  * show() returns available sleep state labels, which may be "mem", "standby",
  * "freeze" and "disk" (hibernation).
  * See Documentation/admin-guide/pm/sleep-states.rst for a description of
-- 
2.31.1