change in documentation

usage/README.md

@@ -15,8 +15,7 @@
 | ```Promise<Model> makeModel(path: string, url: string, id: string)```<br><br>```Promise<SpkModel> makeSpkModel(path: string, url: string, id: string)``` | Make a ```Model``` or ```SpkModel```, model files must be directly under the model root, and compressed model must be in .tgz format. If:<br>- **path** contains valid model files and **id** is the same, there will not be a fetch from **url**.<br>- **path** doesn't contain valid model files, or if it contains valid model files but **id** is different, there will be a fetch from **url**, and the model is stored with **id**.  |
 | ```Promise<Recognizer> makeRecognizer(model: Model, sampleRate: float)``` | Make a ```Recognizer```, it will use **model**'s thread if it's the first user of **model**, else it will use a new thread.
 | ```setLogLevel(lvl: int)``` | Set Vosk's log level (default: ```0```: Info) <br>```-2```: Error<br>```-1```: Warning<br>```1```: Verbose<br>```2```: More verbose<br>```3```: Debug |
-| ```revokeURLs()``` | Revoke the Blob URLs of pthread worker and worklet processor |
-| ```cleanUp()``` | A convenience function that call ```revokeURLs()``` and ```delete()``` on all objects. You should put this at the end of your program! |
+| ```cleanUp()``` | A convenience function that call ```delete()``` on all objects and revoke all URLs. You should put this at the end of your program! |
 
 ## ```Recognizer``` object 
 | Function signature | Description |