is documented. However, this doesn't work very well:
1. It doesn't detect the changes in .rst files. But PySpark internally generates rst files so we can't just simply include it in the detection. Otherwise, it goes to an infinite loop
2. During PySpark documentation generation, it launches some jobs to generate plot images now. This is broken with entr command, and the job fails. Seems like it's related to how entr creates the process internally.