net: sched: pie: update references

RFC 8033 replaces the IETF draft for PIE

Signed-off-by: Mohit P. Tahiliani <tahiliani@nitk.edu.in>
Signed-off-by: Dhaval Khandla <dhavaljkhandla26@gmail.com>
Signed-off-by: Hrishikesh Hiraskar <hrishihiraskar@gmail.com>
Signed-off-by: Manish Kumar B <bmanish15597@gmail.com>
Signed-off-by: Sachin D. Patil <sdp.sachin@gmail.com>
Signed-off-by: Leslie Monis <lesliemonis@gmail.com>
Acked-by: Dave Taht <dave.taht@gmail.com>
Acked-by: Jamal Hadi Salim <jhs@mojatatu.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/sched/sch_pie.c

@@ -17,9 +17,7 @@
  * University of Oslo, Norway.
  *
  * References:
- * IETF draft submission: http://tools.ietf.org/html/draft-pan-aqm-pie-00
- * IEEE  Conference on High Performance Switching and Routing 2013 :
- * "PIE: A * Lightweight Control Scheme to Address the Bufferbloat Problem"
+ * RFC 8033: https://tools.ietf.org/html/rfc8034
  */
 
 #include <linux/module.h>