fix import

Author: LinKCoding

packages/styleguide/src/lib/Meta/About.mdx

@@ -9,7 +9,7 @@ import {
 import { parameters as bestPracticesParameters } from './Best practices.mdx';
 import { parameters as brandParameters } from './Brand.mdx';
 import { parameters as contributingParameters } from './Contributing.mdx';
-import { parameters as deepControlsParameters } from './Deep Controls Add-On.mdx';
+import { parameters as deepControlsParameters } from './Deep Controls add-on.mdx';
 import { parameters as eslintRulesParameters } from './ESLint rules.mdx';
 import { parameters as faqsParameters } from './FAQs.mdx';
 import { parameters as gamutWritingGuideParameters } from './Gamut writing guide/About.mdx';