hir -> hir()

Author: spastorino

src/hir.md

@@ -96,7 +96,7 @@ with a HIR node.
 
 For example, if you have a [`DefId`], and you would like to convert it
 to a [`NodeId`], you can use
-[`tcx.hir.as_local_node_id(def_id)`][as_local_node_id]. This returns
+[`tcx.hir().as_local_node_id(def_id)`][as_local_node_id]. This returns
 an `Option<NodeId>` – this will be `None` if the def-id refers to
 something outside of the current crate (since then it has no HIR
 node), but otherwise returns `Some(n)` where `n` is the node-id of the