Fix doc about promote AWS-NLB Support from alpha to beta#16459

Merged

k8s-ci-robot merged 1 commit intokubernetes:masterfrom M00nF1sh:master

Sep 20, 2019

+3-7

Commits on Sep 19, 2019

promote AWS-NLB Support from alpha to beta (kubernetes#14451 )
M00nF1sh
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