kobject: Fix the kobj_set_name reference in kset_register() kernel-doc

The kernel-doc comment of kset_register() refers to kobj_set_name, which
does not exist. The name is kobject_set_name. Say kobject_set_name.

Fixes: 1662cea4623f ("kset: fix memory leak when kset_register() returns error")
Assisted-by: LLM
Signed-off-by: Karl Mehltretter <kmehltretter@gmail.com>
Reviewed-by: Randy Dunlap <rdunlap@infradead.org>
Link: https://patch.msgid.link/20260911222029.7267-1-kmehltretter@gmail.com
[ Also drop the misplaced braces in "allocated by()". - Danilo ]
Signed-off-by: Danilo Krummrich <dakr@kernel.org>