bpf: Fix the comment for bpf_restore_data_end()

The comment used to say:
> Restore data saved by bpf_compute_data_pointers().

But bpf_compute_data_pointers() does not save the data;
bpf_compute_and_save_data_end() does.

Signed-off-by: Akihiko Odaki <akihiko.odaki@daynix.com>
Acked-by: Stanislav Fomichev <sdf@google.com>
Link: https://lore.kernel.org/r/20231005072137.29870-1-akihiko.odaki@daynix.com
Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>