[PATCH] add release note for 21.11

[Tu, Lijuan]

> -----Original Message-----
> From: Tu, Lijuan <lijuan.tu at intel.com>
> Sent: 2022年2月11日 3:36
> To: ohilyard at iol.unh.edu
> Cc: dts at dpdk.org; Tu, Lijuan <lijuan.tu at intel.com>
> Subject: [PATCH] add release note for 21.11
> 
> Signed-off-by: Lijuan Tu <lijuan.tu at intel.com>

Applied