Fix missing Javadoc @param

Author: philwebb

spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/cache/CacheManagerCustomizers.java

@@ -44,6 +44,7 @@ class CacheManagerCustomizers implements ApplicationContextAware {
 	 * Customize the specified {@link CacheManager}. Locates all
 	 * {@link CacheManagerCustomizer} beans able to handle the specified instance and
 	 * invoke {@link CacheManagerCustomizer#customize(CacheManager)} on them.
+	 * @param <T> the type of cache manager
 	 * @param cacheManager the cache manager to customize
 	 * @return the cache manager
 	 */