Fix DataLoaderInterface comments

Author: enumag

src/DataLoaderInterface.php

@@ -37,7 +37,7 @@ public function load($key): ExtendedPromiseInterface;
     public function loadMany(array $keys): ExtendedPromiseInterface;
 
     /**
-     * Clears the value for the given key from the cache if it exists. Returns itself for method chaining.
+     * Clears the value for the given key from the cache if it exists.
      *
      * @param int|string $key
      *
@@ -46,15 +46,14 @@ public function loadMany(array $keys): ExtendedPromiseInterface;
     public function clear($key): void;
 
     /**
-     * Clears the entire cache. Returns itself for method chaining.
+     * Clears the entire cache.
      *
      * @return void
      */
     public function clearAll(): void;
 
     /**
      * Adds the given key and value to the cache. If the key already exists no change is made.
-     * Returns itself for method chaining.
      *
      * @param int|string $key
      * @param int|string $value