Add other "make dev-..." commands comments

Makefile

@@ -370,15 +370,15 @@ test-apply: set-hmc-version helm-package dev-deploy dev-templates dev-release
 dev-destroy: kind-undeploy registry-undeploy ## Destroy the development environment by deleting the kind cluster and local registry.
 
 .PHONY: dev-mcluster-apply
-dev-mcluster-apply: envsubst
+dev-mcluster-apply: envsubst ## Create dev managed cluster using 'config/dev/$(DEV_PROVIDER)-clusterdeployment.yaml'
 	@NAMESPACE=$(NAMESPACE) $(ENVSUBST) -no-unset -i config/dev/$(DEV_PROVIDER)-clusterdeployment.yaml | $(KUBECTL) apply -f -
 
 .PHONY: dev-mcluster-delete
-dev-mcluster-delete: envsubst
+dev-mcluster-delete: envsubst ## Delete dev managed cluster using 'config/dev/$(DEV_PROVIDER)-clusterdeployment.yaml'
 	@NAMESPACE=$(NAMESPACE) $(ENVSUBST) -no-unset -i config/dev/$(DEV_PROVIDER)-clusterdeployment.yaml | $(KUBECTL) delete -f -
 
 .PHONY: dev-creds-apply
-dev-creds-apply: dev-$(DEV_PROVIDER)-creds
+dev-creds-apply: dev-$(DEV_PROVIDER)-creds ## Create credentials resources for $DEV_PROVIDER
 
 .PHONY: dev-aws-nuke
 dev-aws-nuke: envsubst awscli yq cloud-nuke ## Warning: Destructive! Nuke all AWS resources deployed by 'DEV_PROVIDER=aws dev-mcluster-apply'