build: print 'Formatting Markdown...' for long task markdown formatting

PR-URL: #57108
Reviewed-By: Yagiz Nizipli <yagiz@nizipli.com>
Reviewed-By: Jake Yuesong Li <jake.yuesong@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>

Author: 1ilsang

Makefile

@@ -1408,6 +1408,7 @@ lint-md: lint-js-doc | tools/.mdlintstamp ## Lint the markdown documents maintai
 run-format-md = tools/lint-md/lint-md.mjs --format $(LINT_MD_FILES)
 .PHONY: format-md
 format-md: tools/lint-md/node_modules/remark-parse/package.json ## Format the markdown documents maintained by us in the codebase.
+	$(info Formatting Markdown...)
 	@$(call available-node,$(run-format-md))