add comment about mdx v3 support in prettier

Author: mvvmm

.prettierrc.mjs

@@ -14,6 +14,12 @@ export default {
 				parser: "astro",
 			},
 		},
+		// Prettier's MDX formatter wraps inline JSX elements (like <code> and
+		// <GlossaryTooltip>) onto new lines, which causes MDX v2+ to inject <p>
+		// tags inside them — breaking the rendered HTML. This custom plugin
+		// prevents that by keeping configured elements on a single line.
+		// This may become unnecessary once prettier adds MDX v3 support:
+		// https://github.com/prettier/prettier/issues/12209
 		{
 			files: "*.mdx",
 			options: {