fix: lint errors.

google-cloud-spanner/src/main/java/com/google/cloud/spanner/SessionPoolOptions.java

@@ -550,8 +550,9 @@ public Builder setFailIfPoolExhausted() {
      * If all sessions are in use and there is no more room for creating new sessions, block for a
      * session to become available. Default behavior is same.
      *
-     * <p>By default the requests are blocked for 60s and will fail with a `SpannerException` with error code `ResourceExhausted` if this timeout is exceeded. If you wish to block for a different period
-     * use the option {@link Builder#setAcquireSessionTimeout(Duration)} ()}
+     * <p>By default the requests are blocked for 60s and will fail with a `SpannerException` with
+     * error code `ResourceExhausted` if this timeout is exceeded. If you wish to block for a
+     * different period use the option {@link Builder#setAcquireSessionTimeout(Duration)} ()}
      */
     public Builder setBlockIfPoolExhausted() {
       this.actionOnExhaustion = ActionOnExhaustion.BLOCK;

google-cloud-spanner/src/test/java/com/google/cloud/spanner/BatchCreateSessionsSlowTest.java

@@ -1,3 +1,18 @@
+/*
+ * Copyright 2023 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *       http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
 package com.google.cloud.spanner;
 
 import static com.google.cloud.spanner.MockSpannerTestUtil.READ_ONE_KEY_VALUE_RESULTSET;