doc: mark device-attest-01 challenge support as experimental

Author: christianhoelzl

README.md

@@ -44,6 +44,7 @@ If both `ring` and `aws-lc-rs` are enabled, `aws-lc-rs` will be used.
 ## Limitations
 
 * Only supports P-256 ECDSA account keys for now
+* Device attestation support is experimental
 
 ## Getting started
 

src/order.rs

@@ -465,6 +465,8 @@ impl ChallengeHandle<'_> {
     ///
     /// The function yields the challenge status from the ACME server that validated the
     /// attestation challenge.
+    ///
+    /// Note: Device attestation support is experimental.
     pub async fn send_device_attestation(
         &mut self,
         payload: &DeviceAttestation<'_>,

src/types.rs

@@ -724,6 +724,7 @@ pub enum ChallengeType {
     Dns01,
     #[serde(rename = "tls-alpn-01")]
     TlsAlpn01,
+    /// Note: Device attestation support is experimental
     #[serde(rename = "device-attest-01")]
     DeviceAttest01,
     #[serde(untagged)]