This is abuse if you are repurposing a Wayspot. I would recommend using the Wayspot Removals form to report the new title and let them decide if it is a correction that can be edited in, or an entirely new Wayspot, in which case they would remove the existing Wayspot.
[Edit: staff have said that updating murals is allowed with edits, and this would be a good way to proceed on those corrections. What is considered to be Repurposing? - #4 by NianticAaron]