Merge pull request laravel#5436 from JosephSilber/tap-each-lazy

[6.0] Add comment to clarify that tapEach() is lazy

Author: taylorotwell

collections.md

@@ -2647,6 +2647,8 @@ While the `each` method calls the given callback for each item in the collection
         dump($value);
     });
 
+    // Nothing has been dumped so far...
+
     $array = $lazyCollection->take(3)->all();
 
     // 1