Apply suggestions from review pt.2

Co-authored-by: Vadim Petrochenkov <[email protected]>

Author: zetanumbers

compiler/rustc_metadata/src/native_libs.rs

@@ -165,8 +165,8 @@ impl<'tcx> Collector<'tcx> {
                                     feature_err(
                                         &sess.parse_sess,
                                         sym::link_arg_attribute,
-                                        item.span(),
-                                        "link-arg link kind is unstable",
+                                        span,
+                                        "link kind `link-arg` is unstable",
                                     )
                                     .emit();
                                 }