Handling API interface for Endogenous code exercise

Signed-off-by: wuyongning <wuyongning@huawei.com>

api/@ohos.data.dataAbility.d.ts

@@ -12,6 +12,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
+
 import { AsyncCallback } from './basic';
 import rdb from './@ohos.data.rdb';
 

api/@ohos.data.distributedData.d.ts

@@ -14,6 +14,7 @@
  */
 
 import { AsyncCallback, Callback } from './basic';
+
 /**
  * Providers interfaces to creat a {@link KVManager} istances.
  * @since 7

api/@ohos.data.distributedDataObject.d.ts

@@ -12,6 +12,7 @@
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
+
 import {AsyncCallback, Callback} from './basic';
 
 /**

api/@ohos.data.rdb.d.ts

@@ -12,6 +12,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
+
 import {AsyncCallback, Callback} from './basic';
 import { ResultSet } from './data/rdb/resultSet';
 import Context from "./application/Context";
@@ -260,7 +261,7 @@ declare namespace rdb {
         sync(mode: SyncMode, predicates: RdbPredicates): Promise<Array<[string, number]>>;
 
         /**
-         * Registers a observer for the database. When data in the distributed database changes,
+         * Registers an observer for the database. When data in the distributed database changes,
          * the callback will be invoked.
          *
          * @note N/A

api/@ohos.data.storage.d.ts

@@ -12,6 +12,7 @@
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
+
 import { AsyncCallback, Callback } from './basic';
 
 /**

api/data/rdb/resultSet.d.ts

@@ -12,6 +12,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
+
 import { AsyncCallback } from '../../basic'
 
 /**