Amend Makefile

Added descriptions for each makefile option to increase visibility.
Added platform flag to docker run to enable M* chip compatability.
ND-171

makefile

@@ -1,16 +1,17 @@
 .DEFAULT_GOAL := help
 IMAGE := ministryofjustice/tech-docs-github-pages-publisher:v4.0.0
 
-.PHONY: preview report
 
+.PHONY: preview
 preview: ## Run a local instance of the documentation site, while editing
-	docker run --rm \
+	docker run --platform=linux/amd64 --rm \
 		-v $$(pwd)/config:/app/config \
 		-v $$(pwd)/source:/app/source \
 		-v $$(pwd)/scripts:/scripts \
 		-p 4567:4567 \
 		-it $(IMAGE) /scripts/preview.sh
 
+.PHONY: report
 report: ## Review which pages have expired
 	 ./report-for-daniel-the-manual-spaniel.sh