Update snapshot for https://github.com/mdn/content repository to reflect recent changes.

Author: DavidAnson

test/snapshots/markdownlint-test-repos.js.md

@@ -37,7 +37,7 @@ Generated by [AVA](https://avajs.dev).
 
 > Expected linting violations
 
-    ''
+    'test-repos/mdn-content/files/en-us/web/css/css_nesting/using_css_nesting/index.md: 55: MD012/no-multiple-blanks Multiple consecutive blank lines [Expected: 1; Actual: 2]'
 
 ## https://github.com/mkdocs/mkdocs