docs(nix-compat/nixhash): fix reference

Change-Id: I95c35a1405601c6f79cbc03462ab7c7cd6f08f2a
Reviewed-on: https://cl.tvl.fyi/c/depot/+/10397
Tested-by: BuildkiteCI
Reviewed-by: edef <edef@edef.eu>
Autosubmit: flokli <flokli@flokli.de>

tvix/nix-compat/src/nixhash/mod.rs

@@ -42,7 +42,7 @@ impl NixHash {
     }
 
     /// Constructs a [NixHash] from the Nix default hash format,
-    /// the inverse of [to_nix_hex_string].
+    /// the inverse of [Self::to_nix_hex_string].
     pub fn from_nix_hex_str(s: &str) -> Option<Self> {
         let (tag, digest) = s.split_once(':')?;