Polish

See gh-21481

spring-boot-project/spring-boot/src/main/java/org/springframework/boot/web/embedded/netty/GracefulShutdown.java

@@ -63,7 +63,7 @@ final class GracefulShutdown {
 			callback.shutdownComplete(GracefulShutdownResult.IDLE);
 		}
 		catch (Exception ex) {
-			logger.info("Graceful shutdown aborted with one or more active requests");
+			logger.info("Graceful shutdown aborted with one or more requests still active");
 			callback.shutdownComplete(GracefulShutdownResult.REQUESTS_ACTIVE);
 		}
 		finally {

spring-boot-project/spring-boot/src/main/java/org/springframework/boot/web/embedded/undertow/UndertowWebServer.java

@@ -306,7 +306,7 @@ public class UndertowWebServer implements WebServer {
 			callback.shutdownComplete(GracefulShutdownResult.IMMEDIATE);
 			return;
 		}
-		logger.info("Commencing graceful shutdown. Wait for active requests to complete");
+		logger.info("Commencing graceful shutdown. Waiting for active requests to complete");
 		this.gracefulShutdownCallback.set(callback);
 		this.gracefulShutdown.shutdown();
 		this.gracefulShutdown.addShutdownListener((success) -> notifyGracefulCallback(success));