rust: list: add warning to List::remove docs about mem::take

rust: list: add warning to List::remove docs about mem::take

The previous patches in this series illustrate why the List::remove
method is really dangerous. I think the real takeaway here is to replace
the linked lists with a different data structure without this unsafe
footgun, but for now we fix the bugs and add a warning to the docs.

Signed-off-by: Alice Ryhl <aliceryhl@google.com>
Acked-by: Miguel Ojeda <ojeda@kernel.org>
Link: https://patch.msgid.link/20251111-binder-fix-list-remove-v1-3-8ed14a0da63d@google.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>