fix broken links in the helm guide (#2191)

Author: camilamacedo86

doc/helm/dev/developer_guide.md

@@ -448,7 +448,7 @@ message: "Hello world 2"
 newParameter: "newParam"
 ```
 
-[helm_charts]:https://helm.sh/docs/developing_charts/
-[helm_values]:https://helm.sh/docs/using_helm/#customizing-the-chart-before-installing
+[helm_charts]:https://v2.helm.sh/docs/developing_charts/
+[helm_values]:https://v2.helm.sh/docs/using_helm/#customizing-the-chart-before-installing
 [helm_install]:https://helm.sh/docs/using_helm/
 [helm_operator_user_guide]:../user-guide.md

doc/helm/project_layout.md

@@ -11,4 +11,4 @@ table describes a basic rundown of each generated file/directory.
 | build | Contains scripts that the operator-sdk uses for build and initialization. |
 | watches.yaml | Contains Group, Version, Kind, and Helm chart location. |
 
-[docs_helm_create]:https://helm.sh/docs/helm/#helm-create
+[docs_helm_create]:https://v2.helm.sh/docs/helm/#helm-create

doc/helm/user-guide.md

@@ -329,6 +329,6 @@ kubectl delete -f deploy/crds/example.com_nginxes_crd.yaml
 [docker-tool]:https://docs.docker.com/install/
 [kubectl-tool]:https://kubernetes.io/docs/tasks/tools/install-kubectl/
 [minikube-tool]:https://github.com/kubernetes/minikube#installation
-[helm-charts]:https://helm.sh/docs/developing_charts/
+[helm-charts]:https://v2.helm.sh/docs/developing_charts/
 [helm-values]:https://helm.sh/docs/using_helm/#customizing-the-chart-before-installing
 [quay-link]:https://quay.io