update database

Author: amranidev

docs/database.md

@@ -107,4 +107,16 @@ export default {
   }
 };
 </script>
+```
+
+You can also update or remove a document from the database.
+
+Example:
+
+```javascript
+// delete document.
+this.Person.delete(key)
+
+// update document
+this.Person.update(key)
 ```