[DFDL-WG] updates to experimental features convention document: enums

[Mike Beckerle]

Updates to allow enumeration properties to be extended with new
experimental enum values.

See https://github.com/OpenGridForum/DFDL/pull/32

Mike Beckerle
Apache Daffodil PMC | daffodil.apache.org
OGF DFDL Workgroup Co-Chair | www.ogf.org/ogf/doku.php/standards/dfdl/dfdl
Owl Cyber Defense | www.owlcyberdefense.com
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