update region tags (GoogleCloudPlatform#1281)

Author: averikitsch

appengine-java8/cloudsql-postgres/src/main/java/com/example/appengine/postgresql/PostgreSqlServlet.java

@@ -33,7 +33,6 @@
 import javax.servlet.http.HttpServletRequest;
 import javax.servlet.http.HttpServletResponse;
 
-// [START example]
 @SuppressWarnings("serial")
 // With @WebServlet annotation the webapp/WEB-INF/web.xml is no longer required.
 @WebServlet(name = "PostgreSQL",
@@ -93,4 +92,3 @@ public void init() throws ServletException {
     }
   }
 }
-// [END example]

appengine-java8/cloudsql-postgres/src/main/webapp/WEB-INF/appengine-web.xml

@@ -11,7 +11,7 @@
   See the License for the specific language governing permissions and
   limitations under the License.
 -->
-<!-- [START config] -->
+<!-- [START gae_java8_postgres_config] -->
 <appengine-web-app xmlns="http://appengine.google.com/ns/1.0">
   <threadsafe>true</threadsafe>
   <runtime>java8</runtime>
@@ -20,4 +20,4 @@
     <property name="cloudsql" value="jdbc:postgresql://google/${database}?cloudSqlInstance=${INSTANCE_CONNECTION_NAME}&amp;socketFactory=com.google.cloud.sql.postgres.SocketFactory&amp;user=${user}&amp;password=${password}" />
   </system-properties>
 </appengine-web-app>
-<!-- [END config] -->
+<!-- [END gae_java8_postgres_config] -->

appengine/cloudsql/src/main/java/com/example/appengine/cloudsql/CloudSqlServlet.java

@@ -34,7 +34,7 @@
 import javax.servlet.http.HttpServletRequest;
 import javax.servlet.http.HttpServletResponse;
 
-// [START example]
+// [START gae_java_mysql_app]
 @SuppressWarnings("serial")
 public class CloudSqlServlet extends HttpServlet {
 
@@ -103,4 +103,4 @@ public void doGet(HttpServletRequest req, HttpServletResponse resp) throws IOExc
     }
   }
 }
-// [END example]
+// [END gae_java_mysql_app]