Thank you for contacting CA Agile Central Support with your question. Unfortunately, it is not possible to change a commit and rerun the connector to update the information in a previously posted commit. We recommend creating a new commit with the fixed information and rerunning the connector.
It is possible to use our API to delete a changeset. The instructions are here:
How to delete a changeset
If the changeset was deleted, you could then rerun the connector and pickup the corrected changeset.
I hope this information helps. Please let us know if you have any further questions.