net: skbuff: update comment about pfmemalloc propagating

__skb_fill_page_desc_noacc() is not doing any pfmemalloc
propagating, and yet it has a comment about that, commit
84ce071e ("net: introduce __skb_fill_page_desc_noacc")
may have accidentally moved it to __skb_fill_page_desc_noacc(),
so move it back to __skb_fill_page_desc() which is supposed
to be doing pfmemalloc propagating.

Signed-off-by: Yunsheng Lin <linyunsheng@huawei.com>
CC: Pavel Begunkov <asml.silence@gmail.com>
Reviewed-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/20230515050107.46397-1-linyunsheng@huawei.com


Signed-off-by: Paolo Abeni <pabeni@redhat.com>