Include timeout unit in shutdown failure logging

Closes gh-25058

spring-context/src/main/java/org/springframework/context/support/DefaultLifecycleProcessor.java

@@ -386,7 +386,7 @@ public class DefaultLifecycleProcessor implements LifecycleProcessor, BeanFactor
 				if (latch.getCount() > 0 && !countDownBeanNames.isEmpty() && logger.isInfoEnabled()) {
 					logger.info("Failed to shut down " + countDownBeanNames.size() + " bean" +
 							(countDownBeanNames.size() > 1 ? "s" : "") + " with phase value " +
-							this.phase + " within timeout of " + this.timeout + ": " + countDownBeanNames);
+							this.phase + " within timeout of " + this.timeout + "ms: " + countDownBeanNames);
 				}
 			}
 			catch (InterruptedException ex) {