fixup! Fix TNL-6140

lms/static/sass/discussion/elements/_navigation.scss

@@ -199,7 +199,7 @@
         text-overflow: ellipsis;
 
         @include rtl {
-            // This is counterintuitive, but when showing a preview of the first part of LTR text, using direction: rtl
+            // This is counterintuitive, but when showing a preview of the first part of RTL text, using direction: rtl
             // will actually show the _last_ part of that text.
             direction: ltr;
         }