docs(helm): Added double quotes to example
docs(helm): Added double quotes to example

In the current version of helm (2.8.2), there needs to be double quotes around the value to support escaping special characters.
technosophos/deployment-manager,jascott1/helm,technosophos/deployment-manager,technosophos/k8s-helm,eicnix/helm,SlickNik/helm,appscode/helm,technosophos/deployment-manager,appscode/helm,eicnix/helm,fibonacci1729/helm,SlickNik/helm,jascott1/helm,technosophos/deployment-manager,technosophos/deployment-manager,fibonacci1729/helm,technosophos/k8s-helm