docs: net: fix inaccuracies in msg_zerocopy.rst
Replace "sendpage" with "sendfile". Remove comment about ENOBUFS when the sockopt hasn't been set; experimentation indicates that this is not true. Signed-off-by: nick black <dankamongmen@gmail.com> Reviewed-by: Willem de Bruijn <willemb@google.com> Link: https://lore.kernel.org/r/Y/gg/EhIIjugLdd3@schwarzgerat.orthancSigned-off-by: Jakub Kicinski <kuba@kernel.org>
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