[dpdk-test-report] |SUCCESS| pw89883 doc: add release notes for 21.05

[0-day Robot]

From: robot at bytheb.org

Test-Label: travis-robot
Test-Status: SUCCESS
http://patchwork.dpdk.org/patch/89883/

_travis build: passed_
Build URL: https://travis-ci.com/ovsrobot/dpdk/builds/221260763