Merge pull request #634 from Geolim4/master

Described clear() abstract method

Author: Geolim4

lib/Phpfastcache/Core/Pool/CacheItemPoolTrait.php

@@ -240,11 +240,12 @@ public function clear()
         /**
          * @eventName CacheClearItem
          * @param $this ExtendedCacheItemPoolInterface
-         * @param $deferredList ExtendedCacheItemInterface[]
+         * @param $itemInstances ExtendedCacheItemInterface[]
          */
         $this->eventManager->dispatch('CacheClearItem', $this, $this->itemInstances);
 
         CacheManager::$WriteHits++;
+        // Faster than detachAllItems()
         $this->itemInstances = [];
 
         return $this->driverClear();