Fix package for RemoveFeedItems example (#322)

Author: devchas

google-ads-examples/src/main/java/com/google/ads/googleads/examples/extensions/RemoveFeedItems.java

@@ -12,7 +12,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-package com.google.ads.googleads.examples.remarketing;
+package com.google.ads.googleads.examples.extensions;
 
 import com.beust.jcommander.Parameter;
 import com.google.ads.googleads.examples.utils.ArgumentNames;