Update ui.md
Update ui.md

Fix the Javascript console command for changing the API Root Override.
localStorage.set() is not a function, it's localStorage.setItem()
grepsr/Singularity,andrhamm/Singularity,grepsr/Singularity,andrhamm/Singularity,andrhamm/Singularity,HubSpot/Singularity,grepsr/Singularity,HubSpot/Singularity,HubSpot/Singularity,hs-jenkins-bot/Singularity,HubSpot/Singularity,andrhamm/Singularity,hs-jenkins-bot/Singularity,hs-jenkins-bot/Singularity,grepsr/Singularity,andrhamm/Singularity,grepsr/Singularity,hs-jenkins-bot/Singularity,hs-jenkins-bot/Singularity,HubSpot/Singularity,grepsr/Singularity