Update doc comments
This makes a small change to the doc comment for the
`get_purchase_order` fn in the client to make it consistent with the
other functions.
@@ -105,7 +105,7 @@ pub trait PurchaseOrderClient: Client {
///
/// * `id` - The id of the `PurchaseOrder` containing the `PurchaseOrderVersion` to be retrieved
/// * `version_id` - The version id of the `PurchaseOrderVersion` to be retrieved
- /// * `service_id` - The service ID to fetch the versions from
+ /// * `service_id` - The service ID to fetch the version from
fn get_purchase_order_version(
&self,
id: String,
