support default impl for specialization

fix tidy

Author: giannicic

src/librustdoc/visit_ast.rs

@@ -502,7 +502,13 @@ impl<'a, 'tcx> RustdocVisitor<'a, 'tcx> {
                 om.traits.push(t);
             },
 
-            hir::ItemImpl(unsafety, polarity, defaultness, ref gen, ref tr, ref ty, ref item_ids) => {
+            hir::ItemImpl(unsafety,
+                          polarity,
+                          defaultness,
+                          ref gen,
+                          ref tr,
+                          ref ty,
+                          ref item_ids) => {
                 // Don't duplicate impls when inlining, we'll pick them up
                 // regardless of where they're located.
                 if !self.inlining {