src/doc/en/developer/packaging.rst: Remove outdated example

Author: Matthias Koeppe

src/doc/en/developer/packaging.rst

@@ -1198,8 +1198,6 @@ to a new version, check whether the license changed between versions.
 If an upstream tarball of a package cannot be redistributed for license
 reasons, rename it to include the string ``do-not-distribute``.  This
 will keep the release management scripts from uploading it to the Sage mirrors.
-For an example, see the ``scipoptsuite`` package, which has an "academic"
-proprietary license.
 
 Sometimes an upstream tarball contains some distributable parts using
 a free software license and some non-free parts.  In this case, it can