Docs: add content to Domain Model - Hosts page (#623)

website/content/docs/concepts/domain-model/hosts.mdx

@@ -8,11 +8,36 @@ description: |-
 
 # Hosts
 
-A host is a computing element with a network address reachable from Boundary.
-A Host belongs to one and only one Host Catalog.
-A Host can be contained by zero or more Host Sets.
-Host is abstract.
-A Host is deleted when the Host Catalog it belongs to is deleted.
-The lifecycle of a Host is not tied to the lifecycle of any Host Sets.
+A host is a resource
+that represents a computing element with a network address
+reachable from Boundary.
+A host belongs to a [host catalog][].
+A host can only be included
+by [host sets][]
+from the same host catalog as the host.
 
 ## Attributes
+
+A host has the following configurable attributes:
+
+- `name` - (optional)
+  If set, the `name` must be unique within the host's parent [host catalog][].
+
+- `description` - (optional)
+
+### Static Host Attributes
+
+Static host types have the following additional attribute:
+
+- `address` - (required)
+  Must be at least 3 characters long and not greater than 255 characters.
+
+## Referenced By
+
+- [Host Catalog][]
+- [Host Set][]
+
+[host catalog]: /docs/concepts/domain-model/host-catalogs
+[host catalogs]: /docs/concepts/domain-model/host-catalogs
+[host set]: /docs/concepts/domain-model/host-sets
+[host sets]: /docs/concepts/domain-model/host-sets