HPCC-11079 Docs: nosplit needed for remote copy with variable len fields records

Signed-off-by: Jim DeFabia <jamesdefabia@lexisnexis.com>
Merge pull request #6525 from JamesDeFabia/11079RemoteCopyNosplit

HPCC-11079 Docs: nosplit needed for remote copy with variable len fields

Reviewed-by: Gavin Halliday <ghalliday@hpccsystems.com>