Improve the error message

activerecord/lib/active_record/migration.rb

@@ -876,7 +876,7 @@ def run
             record_version_state_after_migrating(migration.version)
           end
         rescue => e
-          canceled_msg = use_transaction?(migration) ? ", the migration canceled" : ""
+          canceled_msg = use_transaction?(migration) ? ", this migration was canceled" : ""
           raise StandardError, "An error has occurred#{canceled_msg}:\n\n#{e}", e.backtrace
         end
       end

activerecord/test/cases/migration_test.rb

@@ -277,7 +277,7 @@ def migrate(x)
 
     e = assert_raise(StandardError) { migrator.run }
 
-    assert_equal "An error has occurred, the migration canceled:\n\nSomething broke", e.message
+    assert_equal "An error has occurred, this migration was canceled:\n\nSomething broke", e.message
 
     Person.reset_column_information
     assert_not Person.column_methods_hash.include?(:last_name),