Make SimpleXMLElement method return types benevolent (when they return static|null)

Author: ondrejmirtes

resources/functionMap.php

@@ -10517,9 +10517,9 @@
 'SimpleXMLElement::__get' => ['static', 'name'=>'string'],
 'SimpleXMLElement::__toString' => ['string'],
 'SimpleXMLElement::addAttribute' => ['void', 'name'=>'string', 'value='=>'string', 'ns='=>'string'],
-'SimpleXMLElement::addChild' => ['static|null', 'name'=>'string', 'value='=>'string|null', 'ns='=>'string|null'],
+'SimpleXMLElement::addChild' => ['__benevolent<static|null>', 'name'=>'string', 'value='=>'string|null', 'ns='=>'string|null'],
 'SimpleXMLElement::asXML' => ['string|bool', 'filename='=>'string'],
-'SimpleXMLElement::attributes' => ['static|null', 'ns='=>'string', 'is_prefix='=>'bool'],
+'SimpleXMLElement::attributes' => ['__benevolent<static|null>', 'ns='=>'string', 'is_prefix='=>'bool'],
 'SimpleXMLElement::children' => ['__benevolent<static|null>', 'namespaceOrPrefix='=>'string|null', 'is_prefix='=>'bool'],
 'SimpleXMLElement::count' => ['0|positive-int'],
 'SimpleXMLElement::getDocNamespaces' => ['string[]|false', 'recursive='=>'bool', 'from_root='=>'bool'],