`doctl databases firewalls append` removes descriptions for existing rules

[ericu109]

Describe the Issue:
When using doctl databases firewalls append existing rules have their descriptions removed.

Repro:

1. Create a Postgres database cluster
2. Add a rule in the Network Access tab with a description.
3. use doctl databases firewalls append <cluster_id> --rule ip_addr:<ip_address>
4. Refresh the Network Access tab for the database cluster
5. Description added for the rule created in step 2 is now empty.

Environment:

• doctl version: doctl version 1.163.0-release
• OS: Archlinux
• Installation method: package manager, pacman