Fix dead link for definitely not compliant enumNames property

[jnachtigall]

Reasons for making this change

Fix dead link for definitely not compliant enumNames property. Could not find it in any draft or current spec. Since it was descussed for draft-05 I guess it will not be included. Anyways, the link is dead

If this is related to existing tickets, include links to them as well.

Checklist

• I'm updating documentation
  • I've checked the rendering of the Markdown text I've added
• I'm adding or updating code
  • I've added and/or updated tests
  • I've updated docs if needed
• I'm adding a new feature
  • I've updated the playground with an example use of the feature

[epicfaace]

Could you perhaps link to #57, as per json-schema-org/json-schema-spec#921 (comment)?