Fix ReflectionFunctionAbstract::getExtension return type

Author: ondrejmirtes

resources/functionMap.php

@@ -10042,8 +10042,8 @@
 'ReflectionFunctionAbstract::getClosureThis' => ['object|null'],
 'ReflectionFunctionAbstract::getDocComment' => ['string|false'],
 'ReflectionFunctionAbstract::getEndLine' => ['int|false'],
-'ReflectionFunctionAbstract::getExtension' => ['ReflectionExtension'],
-'ReflectionFunctionAbstract::getExtensionName' => ['string'],
+'ReflectionFunctionAbstract::getExtension' => ['ReflectionExtension|null'],
+'ReflectionFunctionAbstract::getExtensionName' => ['string|false'],
 'ReflectionFunctionAbstract::getFileName' => ['string|false'],
 'ReflectionFunctionAbstract::getName' => ['non-empty-string'],
 'ReflectionFunctionAbstract::getNamespaceName' => ['string'],