Minor issues with Mailgun settings screen

@freshyjon, using Firefox, the docs links take me to the correct section. What browser are you using? Or is this fixed for you now on the latest version (1.7.8)?

I am using Chrome and the links don’t work correctly in 1.7.8. They jump for a second, but then jump right back. Video example: https://drive.google.com/uc?id=1_4k-0qdMPfnP6aV0cOUnMv5GA3ImVJzD