Update README file following the review

Author: jadsonmonteiro

README.md

@@ -308,7 +308,7 @@ client.existsEntity(ids).then((resp) => {
 ```
 
 ### `countEntityTotal()`
-Count the number of inserted entities. This method corresponds to a [POST request at /query/count/entity/total](http://panel.slicingdice.com/docs/#api-details-api-endpoints-get-query-count-entity-total).
+Count the number of inserted entities in the whole database. This method corresponds to a [POST request at /query/count/entity/total](http://panel.slicingdice.com/docs/#api-details-api-endpoints-get-query-count-entity-total).
 
 #### Request example