HPCC-8843 Incorrect argument named in docs for Std.File.CreateSuperFile

Signed-off-by: Richard Chapman <rchapman@hpccsystems.com>
Merge pull request #4098 from richardkchapman/minordocs

HPCC-8843 Incorrect argument named in docs for Std.File.CreateSuperFile

Reviewed-by: Gavin Halliday <ghalliday@hpccsystems.com>