Merge branch '336404-syntax-highlighting-has-wrong-inline-background-on-darkmode' into 'master'

Resolve "Syntax highlighting has wrong inline background on darkmode"

See merge request gitlab-org/gitlab!66410

app/assets/stylesheets/application_dark.scss

@@ -58,7 +58,7 @@ body.gl-dark {
     }
   }
 
-  .md code {
+  .md :not(pre.code) > code {
     background-color: $gray-200;
   }
 }