ipc/util.c: complete the kernel-doc function descriptions

Move the function descriptive comments so that they conform to
kernel-doc format, eliminating the kernel-doc warnings.

util.c:618: warning: missing initial short description on line:
 * ipc_obtain_object_idr
util.c:640: warning: missing initial short description on line:
 * ipc_obtain_object_check

Link: https://lkml.kernel.org/r/20250111062905.910576-1-rdunlap@infradead.org
Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

ipc/util.c

@@ -615,12 +615,11 @@ void ipc64_perm_to_ipc_perm(struct ipc64_perm *in, struct ipc_perm *out)
 }
 
 /**
- * ipc_obtain_object_idr
+ * ipc_obtain_object_idr - Look for an id in the ipc ids idr and
+ *   return associated ipc object.
  * @ids: ipc identifier set
  * @id: ipc id to look for
  *
- * Look for an id in the ipc ids idr and return associated ipc object.
- *
  * Call inside the RCU critical section.
  * The ipc object is *not* locked on exit.
  */
@@ -637,13 +636,11 @@ struct kern_ipc_perm *ipc_obtain_object_idr(struct ipc_ids *ids, int id)
 }
 
 /**
- * ipc_obtain_object_check
+ * ipc_obtain_object_check - Similar to ipc_obtain_object_idr() but
+ *   also checks the ipc object sequence number.
  * @ids: ipc identifier set
  * @id: ipc id to look for
  *
- * Similar to ipc_obtain_object_idr() but also checks the ipc object
- * sequence number.
- *
  * Call inside the RCU critical section.
  * The ipc object is *not* locked on exit.
  */