Conflict Review documents should allow "Send Notices To" to be edited by appropriate parties

[rjsparks]

The ability to edit the "send notices to" field should be similar to the ability to change the conflict review text.
cc. @akvezza, @cindymorgan

[russhousley]

Currently, the "Send notices to" cannot be changed if the conflict-review is in one of the approved states. I'll remove that restriction.

[russhousley]

By the way, until the next release comes out, the Secretariat can modify the "send notices to" field by using this URL:

https://datatracker.ietf.org/doc/conflict-review-DRAFT-NAME/conflict-review/notices/