refactors the description wording of events-rake task for better understanding

Author: guainumbi

lib/tasks/events.rake

@@ -1,6 +1,6 @@
 namespace :events do
   namespace :past_events do
-    desc "Deletes personal data from all event applications the day after an event took place"
+    desc "Deletes personal data from all event applications for events that took place during the last week"
     task :delete_data => :environment do
       puts "Deletes applications data..."
       PastEventDateService.delete_application_data_after_event