Document migration path to ingress-nginx chart from stable/nginx-ingress#6038

Merged

k8s-ci-robot merged 3 commits intokubernetes:masterfrom scottrigby:migration-from-stable-nginx-ingress

Aug 19, 2020

+74-242

Commits on Aug 18, 2020

Initial readme changes, with upgrade info on migrating from stable/nginx-ingress
scottrigby
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Link docs to upgrading section of chart readme
scottrigby
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Commits on Aug 19, 2020

Bump chart version PATCH
scottrigby
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