[PATCH] rust: configfs: fix release safety documentation

[Yilin Chen]

The old Safety docs of ItemOperationsVTable<Group<Data>, Data>::release() 
described this as a config_group pointer embedded in Group<Parent>. 

But the inner code implies the implementation first gets the containing 
config_group pointer through the cg_item field. It then gets Group<Data> 
pointer from that group pointer.

The new Safety docs fix this by describing the actual pointer chain and
concrete Group<Data> type, not Group<Parent>.

Assisted-by: Codex:GPT-5
Signed-off-by: Yilin Chen <1479826151@xxxxxx>
---
 rust/kernel/configfs.rs | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/rust/kernel/configfs.rs b/rust/kernel/configfs.rs
index 2339c6467..2ac75c628 100644
--- a/rust/kernel/configfs.rs
+++ b/rust/kernel/configfs.rs
@@ -437,8 +437,10 @@ 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 valid pointer to the `bindings::config_item` embedded in
+    /// the `cg_item` field of a `bindings::config_group`.
+    ///
+    /// That `bindings::config_group` must be embedded in a `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