To uninstall debian-edu-doc-en just follow these instructions.
/debian/stretch/main///install/index.html English documentation from the Debian Edu project Debian 9.0 doc 1.921~20170603
sudo apt-get remove debian-edu-doc-en
Which will remove just the debian-edu-doc-en package itself.
sudo apt-get remove --auto-remove debian-edu-doc-en
This will remove the debian-edu-doc-en package and any other dependant packages which are no longer needed.
If you also want to delete your local/config files for debian-edu-doc-en then this will work.
sudo apt-get purge debian-edu-doc-en
Or similarly, like this debian-edu-doc-en
sudo apt-get purge --auto-remove debian-edu-doc-en
|Maintainer||Debian Edu Developers
|Description||English documentation from the Debian Edu project|