Remove BBR and mention CUBIC which has standardized in RFC8312

draft-ietf-quic-recovery.md

@@ -918,10 +918,7 @@ packet is a probe packet sent after the TLP or RTO timer expires, as described
 in {{tlp}} and {{rto}}.
 
 Implementations MAY use other congestion control algorithms, and endpoints MAY
-use different algorithms from one another. An example would be the
-experimental BBR Congestion Control Mechanism
-{{?I-D.cardwell-iccrg-bbr-congestion-control}} which minimises induced
-latency along delivery path. The signals QUIC provides for
+use other algorithms, such as Cubic {{?RFC8312}}. The signals QUIC provides for
 congestion control are generic and are designed to support different algorithms.
 
 ## Explicit Congestion Notification {#congestion-ecn}