Fix TypeScript errors in ol/format/GML

src/ol/format/GMLBase.js

@@ -237,7 +237,7 @@ class GMLBase extends XMLFeature {
    * @param {Element} node Node.
    * @param {Array<*>} objectStack Object stack.
    * @param {boolean} asFeature whether result should be wrapped as a feature.
-   * @return {Feature} Feature
+   * @return {Feature|Object} Feature
    */
   readFeatureElementInternal(node, objectStack, asFeature) {
     let geometryName;
@@ -301,7 +301,7 @@ class GMLBase extends XMLFeature {
 
 
   /**
-   * @param {Node} node Node.
+   * @param {Element} node Node.
    * @param {Array<*>} objectStack Object stack.
    * @return {Feature} Feature.
    */