Update Makefile

Makefile

@@ -107,7 +107,7 @@ check/trailing:
 check/markdown:
 	$(call _print_check_step,Verifying Markdown files)
 	$(call _ensure_installed,yarn,markdownlint)
-	yarn --silent markdownlint '*.md' --disable MD010 # MD010 does not handle code blocks well.
+	yarn --silent markdownlint '**/*.md' --ignore node_modules
 
 ## Check for potential vulnerabilities across all Go dependencies.
 check/vulns: