Override Node previousSibling to be type of ChildNode. (#744)

* Override Node previousSibling to be type of ChildNode

* Override Node previousSibling to be type of ChildNode : indentation

Author: drivron

baselines/dom.generated.d.ts

@@ -10985,7 +10985,7 @@ interface Node extends EventTarget {
     /**
      * Returns the previous sibling.
      */
-    readonly previousSibling: Node | null;
+    readonly previousSibling: ChildNode | null;
     textContent: string | null;
     appendChild<T extends Node>(newChild: T): T;
     /**

inputfiles/overridingTypes.json

@@ -694,6 +694,9 @@
                         },
                         "nextSibling": {
                             "override-type": "ChildNode | null"
+                        },
+                        "previousSibling": {
+                            "override-type": "ChildNode | null"
                         }
                     }
                 }