Makefile: sort make commands and fix printing newlines

Updates #cleanup

Change-Id: Ia101a4a3005adb9118051b3416f5a64a4a45987d
Signed-off-by: Will Norris <will@tailscale.com>

Makefile

@@ -138,8 +138,10 @@ generate: ## Generate code
 	./tool/go generate ./...
 
 help: ## Show this help
-	@echo "\nSpecify a command. The choices are:\n"
+	@echo ""
-	@grep -hE '^[0-9a-zA-Z_-]+:.*?## .*$$' ${MAKEFILE_LIST} | awk 'BEGIN {FS = ":.*?## "}; {printf "  \033[0;36m%-20s\033[m %s\n", $$1, $$2}'
+	@echo "Specify a command. The choices are:"
+	@echo ""
+	@grep -hE '^[0-9a-zA-Z_-]+:.*?## .*$$' ${MAKEFILE_LIST} | sort | awk 'BEGIN {FS = ":.*?## "}; {printf "  \033[0;36m%-20s\033[m %s\n", $$1, $$2}'
 	@echo ""
 .PHONY: help