Merge pull request #2476 from doctrine/simple-xml-element-case

Fix SimpleXMLElement class name

Author: malarzm

tests/Doctrine/ODM/MongoDB/Tests/Mapping/XmlMappingDriverTest.php

@@ -9,7 +9,7 @@
 use Doctrine\ODM\MongoDB\Mapping\MappingException;
 use Doctrine\Persistence\Mapping\Driver\MappingDriver;
 use ReflectionMethod;
-use SimpleXmlElement;
+use SimpleXMLElement;
 use stdClass;
 
 use function get_class;
@@ -27,7 +27,7 @@ public function testSetShardKeyOptionsByAttributes(): void
     {
         $class   = new ClassMetadata(stdClass::class);
         $driver  = $this->loadDriver();
-        $element = new SimpleXmlElement('<shard-key unique="true" numInitialChunks="4096"><key name="_id"/></shard-key>');
+        $element = new SimpleXMLElement('<shard-key unique="true" numInitialChunks="4096"><key name="_id"/></shard-key>');
 
         /** @uses XmlDriver::setShardKey */
         $m = new ReflectionMethod(get_class($driver), 'setShardKey');