Fix commentary in new test case

tests/extrac25.at

@@ -16,15 +16,7 @@
 # You should have received a copy of the GNU General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 AT_SETUP([extract over parent dir that is dangling symlink])
-AT_KEYWORDS([extract extrac25 to-stdout])
-
-# Description: When extracting over pipe, only regular files should be
-# extracted.  In tar 1.33 this was broken, so that members of other types
-# (in particular, directories) were extracted as usual.  This test ensures
-# that this is no longer the case.
-#
-# References: https://bugs.archlinux.org/task/69373,
-#             https://savannah.gnu.org/bugs/?60002
+AT_KEYWORDS([extract extrac25])
 
 AT_TAR_CHECK([
 mkdir subdir