docs(useStorage): adding indexeddb in docs

docs/useStorage.md

@@ -58,7 +58,7 @@ maps the value in the object store.
 #### Possible Errors
 One of the common possible errors when opening a databaseis ```VER_ERR``` it indicates that the version of the database stored on the 
 disk is greater than the version that you are trying to open. this an error case that must be handled by the 
-error handler.
+error handler
 
 Source, [IndexedDB](https://developer.mozilla.org/en-US/docs/Web/API/IndexedDB_API/Using_IndexedDB
 )