I don't know anything about legal stuff but when I looked it up this is what it says about being docketed. It says 'listing the cases pending trial'
A written list of judicial proceedings set down for trial in a court. To enter the dates of judicial proceedings scheduled for trial in a book kept by a court. In practice, a docket is a roster that the clerk of the court prepares, listing the cases pending trial.
Everything that comes to the Supreme Court gets put on the docket. It’s just the first step in the process. It doesn’t mean they will hear the case or do anything in particular with it.
After being docketed, the case/suit will now go before a three judge panel, who will decide if they will grant “Certiorari”.