Update refs.cfg

diff --git a/refs.cfg b/refs.cfg
index b0c0c81..7de48c3 100644
--- a/refs.cfg
+++ b/refs.cfg

@@ -12,12 +12,6 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 #
-# Defines buckets on cr-buildbucket.appspot.com, used to schedule builds
-# on buildbot. In particular, CQ uses some of these buckets to schedule tryjobs.
-#
-# See http://luci-config.appspot.com/schemas/projects:buildbucket.cfg for
-# schema of this file and documentation.
-#
 # Schema of this file:
 # https://luci-config.appspot.com/schemas/projects:refs.cfg