Minor doc improvement

src/registered.rs

@@ -94,7 +94,8 @@ impl SecretKey {
     /// Constructs a key for a registered application protocol from its constituent parts.
     ///
     /// This is a low-level API. The constructor must only be called with parts that were
-    /// obtained from previous calls to [`Self::data`] and [`Self::chain_code`].
+    /// obtained from previous calls to [`key.data()`][`Self::data`] and
+    /// [`key.chain_code()`][`Self::chain_code`] for some `key: registered::SecretKey`.
     pub fn from_parts(sk: [u8; 32], chain_code: ChainCode) -> Self {
         Self {
             inner: HardenedOnlyKey::from_parts(sk, chain_code),