I got told by Splunks Docs Team to raise a support ticket so they can get the Info from Devs with priority.
I haven't had time yet to do so. Feel free to raise a support ticket to extend this part of the docs:
The documentation for fsck is at https://docs.splunk.com/Documentation/Splunk/7.3.1/Troubleshooting/CommandlinetoolsforusewithSupport.... If it doesn't contain what you need, submit Feedback (not a comment) at the bottom of the page. The Docs team is excellent about updating the documentation based on user feedback.