minor #10646 [DomCrawler] Added return of element name in extract() method (andrey-helldar)

This PR was squashed before being merged into the master branch (closes #10646).

Discussion
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[DomCrawler] Added return of element name in `extract()` method

See a PR: symfony/symfony#29127

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Commits
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b89cd59 [DomCrawler] Added return of element name in `extract()` method

Author: javiereguiluz

components/dom_crawler.rst

@@ -214,12 +214,13 @@ Extract attribute and/or node values from the list of nodes::
 
     $attributes = $crawler
         ->filterXpath('//body/p')
-        ->extract(array('_text', 'class'))
+        ->extract(array('_name', '_text', 'class'))
     ;
 
 .. note::
 
-    Special attribute ``_text`` represents a node value.
+    Special attribute ``_text`` represents a node value, while ``_name`` represents element name.
+    Attribute ``_name`` will be added in version 4.3.
 
 Call an anonymous function on each node of the list::