fix checkstyle

Author: panchenko

servlet/src/main/java/io/grpc/servlet/AsyncServletOutputStreamWriter.java

@@ -127,7 +127,8 @@ public void finest(String str, Object... params) {
             try {
               asyncContext.complete();
             } catch (IllegalStateException ignored) {
-              // Tomcat can throw "Calling [asyncComplete()] is not valid for a request with Async state [COMPLETING]"
+              // Tomcat can throw:
+              // Calling [asyncComplete()] is not valid for a request with Async state [COMPLETING]
             }
             log.fine("call completed");
           });

servlet/src/main/java/io/grpc/servlet/ServletServerStream.java

@@ -303,7 +303,8 @@ public void cancel(Status status) {
         try {
           asyncCtx.complete();
         } catch (IllegalStateException ignored) {
-          // Tomcat can throw "Calling [asyncComplete()] is not valid for a request with Async state [COMPLETING]"
+          // Tomcat can throw:
+          // Calling [asyncComplete()] is not valid for a request with Async state [COMPLETING]
         }
         countDownLatch.countDown();
       });