fix(docs): Remove "no nested globals allowed"
fix(docs): Remove "no nested globals allowed"

Remove incorrect statements in charts.md about nested globals not being allowed.

helm/helm,SlickNik/helm,kdada/helm,eicnix/helm,FengyunPan/helm,jascott1/helm,technosophos/k8s-helm,michelleN/deployment-manager,adamreese/deployment-manager,technosophos/k8s-helm,thomastaylor312/helm,fibonacci1729/helm,technosophos/deployment-manager,appscode/helm,bacongobbler/helm,helm/helm,adamreese/deployment-manager,flynnduism/helm,adamreese/helm,michelleN/deployment-manager,rbwsam/helm,kdada/helm,bacongobbler/helm,rbwsam/helm,michelleN/deployment-manager,SlickNik/helm,FengyunPan/helm,jascott1/helm,fibonacci1729/helm,sushilkm/helm,michelleN/deployment-manager,flynnduism/helm,technosophos/deployment-manager,technosophos/deployment-manager,eicnix/helm,adamreese/helm,adamreese/deployment-manager,technosophos/deployment-manager,adamreese/deployment-manager,adamreese/deployment-manager,thomastaylor312/helm,technosophos/deployment-manager,appscode/helm,sushilkm/helm