Set api annotation on classdesc, not constructor

src/ol/layer/Layer.js

@@ -43,26 +43,26 @@ import SourceState from '../source/State.js';
  * @property {number} minResolution
  */
 
-
+/**
+ * @classdesc
+ * Abstract base class; normally only used for creating subclasses and not
+ * instantiated in apps.
+ * A visual representation of raster or vector map data.
+ * Layers group together those properties that pertain to how the data is to be
+ * displayed, irrespective of the source of that data.
+ *
+ * Layers are usually added to a map with {@link module:ol/Map#addLayer}. Components
+ * like {@link module:ol/interaction/Select~Select} use unmanaged layers
+ * internally. These unmanaged layers are associated with the map using
+ * {@link module:ol/layer/Layer~Layer#setMap} instead.
+ *
+ * A generic `change` event is fired when the state of the source changes.
+ *
+ * @fires module:ol/render/Event~RenderEvent
+ */
 class Layer extends BaseLayer {
   /**
-   * @classdesc
-   * Abstract base class; normally only used for creating subclasses and not
-   * instantiated in apps.
-   * A visual representation of raster or vector map data.
-   * Layers group together those properties that pertain to how the data is to be
-   * displayed, irrespective of the source of that data.
-   *
-   * Layers are usually added to a map with {@link module:ol/Map#addLayer}. Components
-   * like {@link module:ol/interaction/Select~Select} use unmanaged layers
-   * internally. These unmanaged layers are associated with the map using
-   * {@link module:ol/layer/Layer~Layer#setMap} instead.
-   *
-   * A generic `change` event is fired when the state of the source changes.
-   *
-   * @fires module:ol/render/Event~RenderEvent
    * @param {module:ol/layer/Layer~Options} options Layer options.
-   * @api
    */
   constructor(options) {