Update the comment for Makefile taks live-docs

There is a typo in comment for port that used for listening of docs server.
Changed from http://localhost:3000 to http://localhost:8000

Makefile

@@ -163,7 +163,7 @@ dev-env-stop: ## Deletes local Kubernetes cluster created by kind.
 	@kind delete cluster --name ingress-nginx-dev
 
 .PHONY: live-docs
-live-docs: ## Build and launch a local copy of the documentation website in http://localhost:3000
+live-docs: ## Build and launch a local copy of the documentation website in http://localhost:8000
 	@docker run --rm -it \
 		-p 8000:8000 \
 		-v ${PWD}:/docs \