Merge branch 'bootstrap-markdown-code-highlight' into 'master'

Fix markdown code highlighting

Closes #47131

See merge request gitlab-org/gitlab-ce!19325

app/assets/stylesheets/bootstrap_migration.scss

@@ -61,8 +61,18 @@ a {
 
 code {
   padding: 2px 4px;
+  color: $red-600;
   background-color: $red-100;
   border-radius: 3px;
+
+  .code & {
+    background-color: inherit;
+    padding: unset;
+  }
+}
+
+.code {
+  padding: 9.5px;
 }
 
 table {