[PATCH v2] rust: configfs: fix release safety documentation

[Yilin Chen <1479826151@qq.com>]

ItemOperationsVTable<Group<Data>, Data>::release() receives a pointer
to a config_item, not a config_group.

The old Safety docs described the pointer as a config_group embedded in
Group<Parent>. Update them to state that the pointer must be the cg_item
field of a config_group embedded in a valid Group<Data>.

Assisted-by: Codex:GPT-5
Signed-off-by: Yilin Chen <1479826151@qq.com>
---
Changes in v2:
- Use the wording suggested in review: describe `this` as the `cg_item`
  field of a `bindings::config_group` embedded in a valid `Group<Data>`.

 rust/kernel/configfs.rs | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/rust/kernel/configfs.rs b/rust/kernel/configfs.rs
index 2339c6467..b626eb7dc 100644
--- a/rust/kernel/configfs.rs
+++ b/rust/kernel/configfs.rs
@@ -437,8 +437,8 @@ impl<Data> ItemOperationsVTable<Group<Data>, Data>
 {
     /// # Safety
     ///
-    /// `this` must be a pointer to a `bindings::config_group` embedded in a
-    /// `Group<Parent>`.
+    /// `this` must be a pointer to the `cg_item` field of a `bindings::config_group` embedded in a
+    /// valid `Group<Data>`.
     ///
     /// This function will destroy the pointee of `this`. The pointee of `this`
     /// must not be accessed after the function returns.
-- 
2.25.1