use behavior instead of behaviour

Author: OskarStark

Dumper/XmlDumper.php

@@ -290,12 +290,12 @@ private function convertParameters(array $parameters, $type, \DOMElement $parent
             } elseif ($value instanceof Reference) {
                 $element->setAttribute('type', 'service');
                 $element->setAttribute('id', (string) $value);
-                $behaviour = $value->getInvalidBehavior();
-                if (ContainerInterface::NULL_ON_INVALID_REFERENCE == $behaviour) {
+                $behavior = $value->getInvalidBehavior();
+                if (ContainerInterface::NULL_ON_INVALID_REFERENCE == $behavior) {
                     $element->setAttribute('on-invalid', 'null');
-                } elseif (ContainerInterface::IGNORE_ON_INVALID_REFERENCE == $behaviour) {
+                } elseif (ContainerInterface::IGNORE_ON_INVALID_REFERENCE == $behavior) {
                     $element->setAttribute('on-invalid', 'ignore');
-                } elseif (ContainerInterface::IGNORE_ON_UNINITIALIZED_REFERENCE == $behaviour) {
+                } elseif (ContainerInterface::IGNORE_ON_UNINITIALIZED_REFERENCE == $behavior) {
                     $element->setAttribute('on-invalid', 'ignore_uninitialized');
                 }
             } elseif ($value instanceof Definition) {