Streamline code.

src/engine_api.rs

@@ -1232,7 +1232,7 @@ impl Engine {
         Self::read_file(path).and_then(|contents| Ok(self.compile_with_scope(scope, &contents)?))
     }
     /// Parse a JSON string into an [object map][`Map`].
-    /// This is a light-weight alternative to using, say, [`serde_json`][https://crates.io/crates/serde_json] to deserialize the JSON.
+    /// This is a light-weight alternative to using, say, [`serde_json`] to deserialize the JSON.
     ///
     /// The JSON string must be an object hash.  It cannot be a simple scalar value.
     ///