Clean up TODO comments for new room list

All relevant TODOs should still be present, and reference an issue for easy finding.

res/css/views/rooms/_RoomBreadcrumbs2.scss

@@ -14,6 +14,8 @@ See the License for the specific language governing permissions and
 limitations under the License.
 */
 
+// TODO: Rename on launch: https://github.com/vector-im/riot-web/issues/14231
+
 .mx_RoomBreadcrumbs2 {
     width: 100%;