docs(remark-drawio): link issue from foreignObject reset comment

Refs #11052

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

packages/remark-drawio/src/components/DrawioViewer.module.scss

@@ -18,6 +18,8 @@
 // weight). Defending the foreignObject content is an adversarial cross-cutting
 // concern, so we explicitly opt out of the specificity contest rather than
 // chasing host selectors.
+//
+// See: https://github.com/growilabs/growi/issues/11052
 .drawio-viewer foreignObject {
   h1, h2, h3, h4, h5, h6,
   p, ul, ol, li, blockquote,