This summary is not the rule. The rule text controls.
If a court document has a typo or small mistake, like a wrong date or a misspelled name, the judge can fix it at any time. This also covers cases where something was accidentally left out of the record or written down wrong because someone made an honest mistake, not because a legal decision was wrong.
Before making the fix, the judge can decide if anyone involved in the case needs to be told about the change first. The judge has the power to give notice if it seems like a good idea, but the rule doesn't require it in every situation.
This rule only covers small clerical fixes. It does not let a judge change their mind about a ruling or decision. It's meant for correcting mistakes in how something was written down or recorded, not for changing what the court actually decided.