Add context to linter for MD004 rule (#55732)

Author: felicitymay

src/content-linter/style/base.js

@@ -28,6 +28,7 @@ export const baseConfig = {
     style: 'asterisk',
     'partial-markdown-files': true,
     'yml-files': false,
+    context: `We use asterisks to format bulleted lists because this gives clearer, more accessible source code.`,
   },
   'no-trailing-spaces': {
     // MD009