Format code for clarity in build_detailed_term_def

Improved code readability by splitting the chained method call on attr.dtypes.first() across multiple lines in build_detailed_term_def.

Author: JR-1991

src/jsonld/export.rs

@@ -186,7 +186,8 @@ fn build_detailed_term_def(
 ) -> TermDef {
     // Determine type using the first dtype, falling back to parent_object if needed
     let object_type = attr
-        .dtypes.first()
+        .dtypes
+        .first()
         .and_then(|dtype| find_sub_object(graph, dtype))
         .map(|_idx| "@id".to_string());