feat: generate sample code in the Java microgenerator (#859)

Committer: @miraleung PiperOrigin-RevId: 356341083 Source-Author: Google APIs <noreply@google.com> Source-Date: Mon Feb 8 13:33:28 2021 -0800 Source-Repo: googleapis/googleapis Source-Sha: 8d8c008e56f1af31d57f75561e0f1848ffb29eeb Source-Link: googleapis/googleapis@8d8c008

Author: yoshi-automation

google-cloud-spanner/src/main/java/com/google/cloud/spanner/admin/database/v1/DatabaseAdminClient.java

@@ -26,6 +26,13 @@
  * list backups for a database and to restore from an existing backup.
  *
  * <p>Sample for DatabaseAdminClient:
+ *
+ * <pre>{@code
+ * try (DatabaseAdminClient databaseAdminClient = DatabaseAdminClient.create()) {
+ * DatabaseName name = DatabaseName.of("[PROJECT]", "[INSTANCE]", "[DATABASE]");
+ * Database response = databaseAdminClient.getDatabase(name);
+ * }
+ * }</pre>
  */
 @Generated("by gapic-generator-java")
 package com.google.cloud.spanner.admin.database.v1;