minor symfony#24564 add DOMElement as return type in Crawler::getIterator to support foreach support in ide (Haehnchen)

This PR was merged into the 3.3 branch.

Discussion
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add DOMElement as return type in Crawler::getIterator to support foreach support in ide

| Q             | A
| ------------- | ---
| Branch?       | 3.3
| Bug fix?      | no
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| License       | MIT

In `Crawler::getIterator` return type is missing so ide (PhpStorm) is not able to provide completion inside foreach statements. This PR adds `DOMElement[]` to it

```php
$crawler = new Crawler('foobar');
foreach($crawler->filter('a') as $link) {
   # support completion
   $link->...
}
```

Commits
-------

2350597 add DOMElement as return type in Crawler::getIterator to support foreach support in ide

Author: fabpot

src/Symfony/Component/DomCrawler/Crawler.php

@@ -1071,7 +1071,7 @@ public function count()
     }
 
     /**
-     * @return \ArrayIterator
+     * @return \ArrayIterator|\DOMElement[]
      */
     public function getIterator()
     {