Set api annotation on classdesc, not constructor

src/ol/structs/LRUCache.js

@@ -17,6 +17,7 @@ import EventType from '../events/EventType.js';
 
 
 /**
+ * @classdesc
  * Implements a Least-Recently-Used cache where the keys do not conflict with
  * Object's properties (e.g. 'hasOwnProperty' is not allowed as a key). Expiring
  * items from the cache is the responsibility of the user.

src/ol/structs/LinkedList.js

@@ -10,12 +10,13 @@
  * @property {?} data
  */
 
-
+/**
+ * @classdesc
+ * Creates an empty linked list structure.
+ */
 class LinkedList {
 
   /**
-   * Creates an empty linked list structure.
-   *
    * @param {boolean=} opt_circular The last item is connected to the first one,
    * and the first item to the last one. Default is true.
    */

src/ol/structs/PriorityQueue.js

@@ -12,6 +12,7 @@ export const DROP = Infinity;
 
 
 /**
+ * @classdesc
  * Priority queue.
  *
  * The implementation is inspired from the Closure Library's Heap class and

src/ol/structs/RBush.js

@@ -16,13 +16,13 @@ import {isEmpty} from '../obj.js';
  */
 
 /**
+ * @classdesc
  * Wrapper around the RBush by Vladimir Agafonkin.
  * See https://github.com/mourner/rbush.
  *
  * @template T
  */
 class RBush {
-
   /**
    * @param {number=} opt_maxEntries Max entries.
    */