Document all features on docs.rs

Cargo.toml

@@ -85,6 +85,9 @@ log-debug = []
 log-warn = []
 log-error = []
 
+[package.metadata.docs.rs]
+all-features = true
+
 [patch.crates-io]
 trussed-chunked = { path = "extensions/chunked" }
 trussed-hkdf = { path = "extensions/hkdf" }

src/lib.rs

@@ -2,6 +2,7 @@
 // SPDX-License-Identifier: Apache-2.0 or MIT
 
 #![cfg_attr(not(any(test, feature = "std")), no_std)]
+#![cfg_attr(docsrs, feature(doc_cfg))]
 #![warn(non_ascii_idents, trivial_casts, unused, unused_qualifications)]
 #![deny(unsafe_code)]