api-types: add missing doc-comment description for api enums

this is used as description in the api schema

Signed-off-by: Thomas Lamprecht <t.lamprecht@proxmox.com>
(cherry picked from commit c606fdaa889a6ffcb6e52eb9c6c5f73de146364e)

pbs-api-types/src/lib.rs

@@ -270,6 +270,7 @@ pub enum NodePowerCommand {
 #[api()]
 #[derive(Eq, PartialEq, Debug, Serialize, Deserialize)]
 #[serde(rename_all = "lowercase")]
+/// The state (result) of a finished worker task.
 pub enum TaskStateType {
     /// Ok
     OK,

pbs-api-types/src/tape/drive.rs

@@ -112,6 +112,7 @@ pub struct MamAttribute {
 
 #[api()]
 #[derive(Serialize, Deserialize, Copy, Clone, Debug, PartialOrd, PartialEq)]
+/// The density of a tape medium, derived from the LTO version.
 pub enum TapeDensity {
     /// Unknown (no media loaded)
     Unknown,