Apply suggestions from code review

Author: eddumelendez

modules/postgresql/src/test/java/org/testcontainers/postgresql/PostgreSQLContainerTest.java

@@ -133,12 +133,10 @@ void testCustomCredentials() {
         ) {
             postgres.start();
 
-            // Validações (Asserts)
             assertThat(postgres.getDatabaseName()).isEqualTo("my_db");
             assertThat(postgres.getUsername()).isEqualTo("my_user");
             assertThat(postgres.getPassword()).isEqualTo("my_secret");
 
-            // Valida se a URL de conexão reflete as mudanças
             String jdbcUrl = postgres.getJdbcUrl();
             assertThat(jdbcUrl).contains("/my_db");
         }