minor symfony#6390 Reworded the example about $deep param (Oliboy50, javiereguiluz)

This PR was merged into the 2.8 branch.

Discussion
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Reworded the example about $deep param

This finishes symfony#6333.

Commits
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09bc39e Reworded the example about $deep param
f82b32e [HttpFoundation] ParameterBag::get() $deep param

Author: xabbuh

components/http_foundation/introduction.rst

@@ -147,25 +147,28 @@ exist::
     // the query string is '?foo=bar'
 
     $request->query->get('foo');
-    // returns bar
+    // returns 'bar'
 
     $request->query->get('bar');
     // returns null
 
-    $request->query->get('bar', 'bar');
-    // returns 'bar'
+    $request->query->get('bar', 'baz');
+    // returns 'baz'
 
 When PHP imports the request query, it handles request parameters like
 ``foo[bar]=bar`` in a special way as it creates an array. So you can get the
 ``foo`` parameter and you will get back an array with a ``bar`` element::
 
-    // the query string is '?foo[bar]=bar'
+    // the query string is '?foo[bar]=baz'
 
     $request->query->get('foo');
-    // returns array('bar' => 'bar')
+    // returns array('bar' => 'baz')
 
     $request->query->get('foo[bar]');
-    // returns null   
+    // returns null
+
+    $request->query->get('foo')['bar'];
+    // returns 'baz'
 
 .. _component-foundation-attributes: