To uninstall unity-scope-devhelp just follow these instructions.
sudo apt-get remove unity-scope-devhelp
This will remove just the unity-scope-devhelp package itself.
sudo apt-get remove --auto-remove unity-scope-devhelp
This will remove the unity-scope-devhelp package and any other dependant packages which are no longer needed.
If you also want to delete your local/config files for unity-scope-devhelp then this will work.
sudo apt-get purge unity-scope-devhelp
Or similarly, like this unity-scope-devhelp
sudo apt-get purge --auto-remove unity-scope-devhelp
|Maintainer||Ubuntu Developers <email@example.com>|
|Description||devhelp scope for Unity|