You might have to learn thinking out of the box, what is unnecessary for you can be helpful for someone else. Hover-text’s can help someone with problems of visibility. Hover-text on websites show the alternative tag. This can be used to explain something more as just a link does. If it is repeating the same as the link says the alt text is missing.
So might be that this links helps to solve your problem:
[SOLVED] Gnome Shell tool tips / Applications & Desktop Environments / Arch Linux Forums
Please start to write what you want to achieve not just what you annoys. Search engines mostly also give you help in such cases. (Duckduckgo=switch of tooltips in gnome-shell)