fix cli-doc generate (#78)

Makefile

@@ -70,7 +70,7 @@ cli-docs: ## generate cli documenation
 		docs/content/reference/pgo.md > \
 		docs/content/reference/_index.md
 	rm docs/content/reference/pgo.md
-	@echo "Break out a separate code block for `Example output`"
+	@echo "Break out a separate code block for \`Example output\`"
 	for filename in $(wildcard docs/content/reference/pgo_*.md); do \
 		NL=$$'\n'; \
 		sed -i "s/### Example output/\`\`\`\\$${NL}### Example output\\$${NL}\`\`\`/g" $${filename}; \