Polish "Remove unnecessary leading slash in changelog locations"

See gh-19926

spring-boot-samples/spring-boot-sample-liquibase/src/test/java/sample/liquibase/SampleLiquibaseApplicationTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2020 the original author or authors.
+ * Copyright 2012-2019 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -61,9 +61,9 @@ public class SampleLiquibaseApplicationTests {
 		assertThat(output).contains("Successfully acquired change log lock")
 				.contains("Creating database history " + "table with name: PUBLIC.DATABASECHANGELOG")
 				.contains("Table person created")
-				.contains("ChangeSet classpath:db/" + "changelog/db.changelog-master.yaml::1::"
+				.contains("ChangeSet classpath:/db/" + "changelog/db.changelog-master.yaml::1::"
 						+ "marceloverdijk ran successfully")
-				.contains("New row inserted into person").contains("ChangeSet classpath:db/changelog/"
+				.contains("New row inserted into person").contains("ChangeSet classpath:/db/changelog/"
 						+ "db.changelog-master.yaml::2::" + "marceloverdijk ran successfully")
 				.contains("Successfully released change log lock");
 	}