Update cheatsheets

doctl-databases-firewalls

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# doctl databases firewalls
+
+> Manage firewalls for database clusters.
+> More information: <https://docs.digitalocean.com/reference/doctl/reference/databases/firewalls>.
+
+- Run a `doctl databases firewalls` command with an access token:
+
+`doctl databases firewalls {{command}} --access-token {{access_token}}`
+
+- Retrieve a list of firewall rules for a given database:
+
+`doctl databases firewalls list`
+
+- Add a database firewall rule to a given database:
+
+`doctl databases firewalls append {{database_id}} --rule {{droplet|k8s|ip_addr|tag|app}}:{{value}}`
+
+- Remove a firewall rule for a given database:
+
+`doctl databases firewalls remove {{database_id}} {{rule_uuid}}`