HPCC-8549 Document all the DICTIONARY syntax changes.
HPCC-8543 Document the new { default(value) } attribute on a field

Signed-off-by: Richard Taylor <richard.taylor@lexisnexis.com>
HPCC-8549 Document all the DICTIONARY syntax changes. Edits

Signed-off-by: Richard Taylor <richard.taylor@lexisnexis.com>
HPCC-8549 Document all the DICTIONARY syntax changes. more edits

Signed-off-by: Richard Taylor <richard.taylor@lexisnexis.com>
Merge pull request #4039 from RichardTaylorHPCC/B8549

HPCC-8549 Document all the DICTIONARY syntax changes.

Reviewed-by: Gavin Halliday <ghalliday@hpccsystems.com>