Fix a typo

Closes gh-34101

spring-beans/src/main/java/org/springframework/beans/factory/support/DefaultListableBeanFactory.java

@@ -177,7 +177,7 @@ public class DefaultListableBeanFactory extends AbstractAutowireCapableBeanFacto
 	/** Map from bean name to merged BeanDefinitionHolder. */
 	private final Map<String, BeanDefinitionHolder> mergedBeanDefinitionHolders = new ConcurrentHashMap<>(256);
 
-	// Set of bean definition names with a primary marker. */
+	/** Set of bean definition names with a primary marker. */
 	private final Set<String> primaryBeanNames = ConcurrentHashMap.newKeySet(16);
 
 	/** Map of singleton and non-singleton bean names, keyed by dependency type. */