Fix typos in Javadoc

spring-beans/src/main/java/org/springframework/beans/factory/xml/BeanDefinitionParserDelegate.java

@@ -534,7 +534,7 @@ public class BeanDefinitionParserDelegate {
 
 	/**
 	 * Parse the bean definition itself, without regard to name or aliases. May return
-	 * <code>null</code> if problems occured during the parse of the bean definition.
+	 * <code>null</code> if problems occurred during the parsing of the bean definition.
 	 */
 	public AbstractBeanDefinition parseBeanDefinitionElement(
 			Element ele, String beanName, BeanDefinition containingBean) {