Prefer @override in the case there is no other annotations

See
https://github.com/google/closure-compiler/wiki/Annotating-JavaScript-for-the-Closure-Compiler#override

src/ol/source/tileutfgrid.js

@@ -480,7 +480,7 @@ ol.source.TileUTFGrid.Tile_.prototype.onXHRError_ = function(event) {
 
 
 /**
- * @inheritDoc
+ * @override
  */
 ol.source.TileUTFGrid.Tile_.prototype.load = function() {
   if (this.preemptive_) {

src/ol/source/vector.js

@@ -653,7 +653,7 @@ ol.source.Vector.prototype.getOverlaps = function() {
 
 
 /**
- * @inheritDoc
+ * @override
  */
 ol.source.Vector.prototype.getResolutions = function() {};