docs(Collector): properly document endReason (#6016)

src/structures/interfaces/Collector.js

@@ -264,6 +264,14 @@ class Collector extends EventEmitter {
   }
 
   /* eslint-disable no-empty-function */
+  /**
+   * The reason this collector has ended with, or null if it hasn't ended yet
+   * @type {?string}
+   * @readonly
+   * @abstract
+   */
+  get endReason() {}
+
   /**
    * Handles incoming events from the `handleCollect` function. Returns null if the event should not
    * be collected, or returns an object describing the data that should be stored.
@@ -284,13 +292,6 @@ class Collector extends EventEmitter {
    */
   dispose() {}
   /* eslint-enable no-empty-function */
-
-  /**
-   * The reason this collector has ended with, or null if it hasn't ended yet
-   * @name Collector#endReason
-   * @type {?string}
-   * @abstract
-   */
 }
 
 module.exports = Collector;