dynamic host volumes: document option for node pool governance

For Nomad Enterprise, the namespace specification's node pool configuration can
control access to node pools for dynamic host volumes as well.

Ref: #24797
Ref: https://hashicorp.atlassian.net/browse/NET-11482

website/content/docs/other-specifications/namespace.mdx

@@ -108,20 +108,22 @@ consul {
 
 ### `node_pool_config` Parameters <EnterpriseAlert inline />
 
-- `default` `(string: "default")` - Specifies the node pool to use for jobs in
-  this namespace that don't define a node pool in their specification.
+- `default` `(string: "default")` - Specifies the node pool to use for jobs or
+  dynamic host volumes in this namespace that don't define a node pool in their
+  specification.
 
 - `allowed` `(array<string>: nil)` - Specifies the node pools that are allowed
-  to be used by jobs in this namespace. By default, all node pools are allowed.
-  If an empty list is provided only the namespace's default node pool is
-  allowed. This field supports wildcard globbing through the use of `*` for
-  multi-character matching. This field cannot be used with `denied`.
+  to be used by jobs or dynamic host volumes in this namespace. By default, all
+  node pools are allowed. If an empty list is provided only the namespace's
+  default node pool is allowed. This field supports wildcard globbing through
+  the use of `*` for multi-character matching. This field cannot be used with
+  `denied`.
 
 - `denied` `(array<string>: nil)` - Specifies the node pools that are not
-  allowed to be used by jobs in this namespace. This field supports wildcard
-  globbing through the use of `*` for multi-character matching. If specified,
-  any node pool is allowed to be used, except for those that match any of these
-  patterns. This field cannot be used with `allowed`.
+  allowed to be used by jobs or dynamic host volumes in this namespace. This
+  field supports wildcard globbing through the use of `*` for multi-character
+  matching. If specified, any node pool is allowed to be used, except for those
+  that match any of these patterns. This field cannot be used with `allowed`.
 
 ### `vault` Parameters <EnterpriseAlert inline />