feat: added region tags

Author: kikoso

ApiDemos/java/app/src/main/java/com/example/mapdemo/DataDrivenBoundariesActivity.java

@@ -43,6 +43,7 @@
  * on how the Data-driven styling for boundaries work, check out the following link:
  * https://developers.google.com/maps/documentation/android-sdk/dds-boundaries/overview
  */
+// [START maps_android_data_driven_styling_boundaries]
 public class DataDrivenBoundariesActivity extends AppCompatActivity implements OnMapReadyCallback,
         FeatureLayer.OnFeatureClickListener {
 
@@ -224,3 +225,4 @@ private List<String> getPlaceIds(List<Feature> features) {
         return placeIds;
     }
 }
+// [END maps_android_data_driven_styling_boundaries]

ApiDemos/java/app/src/main/java/com/example/mapdemo/DataDrivenDatasetStylingActivity.java

@@ -41,6 +41,7 @@
  * on how the Data-driven styling for boundaries work, check out the following link:
  * https://developers.google.com/maps/documentation/android-sdk/dds-datasets/overview
  */
+// [START maps_android_data_driven_styling_datasets]
 public class DataDrivenDatasetStylingActivity extends AppCompatActivity implements OnMapReadyCallback, FeatureLayer.OnFeatureClickListener {
 
     private static final LatLng SEATTLE = new LatLng(47.6062, -122.3321);
@@ -249,3 +250,4 @@ private void styleDatasetsLayerClickEvent() {
         }
     }
 }
+// [END maps_android_data_driven_styling_datasets]