Update region tags (#1103)

* Update logback.xml

* Update logging.properties

* Update Quickstart.java

* Update Quickstart.java

Author: Ace Nassri

samples/snippets/src/main/java/com/example/logging/logback/Quickstart.java

@@ -16,7 +16,7 @@
 
 package com.example.logging.logback;
 
-// [START logback_quickstart]
+// [START logging_logback_quickstart]
 
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
@@ -29,4 +29,4 @@ public static void main(String[] args) {
     logger.error("Logging ERROR with Logback");
   }
 }
-// [END logback_quickstart]
+// [END logging_logback_quickstart]

samples/snippets/src/main/resources/logback.xml

@@ -13,7 +13,7 @@
   See the License for the specific language governing permissions and
   limitations under the License.
 -->
-<!-- [START logback_config] -->
+<!-- [START logging_logback_config] -->
 <configuration>
   <appender name="CLOUD" class="com.google.cloud.logging.logback.LoggingAppender">
     <!-- Optional : filter logs at or above a level -->
@@ -30,4 +30,4 @@
     <appender-ref ref="CLOUD" />
   </root>
 </configuration>
-<!-- [END logback_config] -->
+<!-- [END logging_logback_config] -->