chore: remove 'matches upstream' comment — describe behavior directly

Author: johanrd

lib/rules/template-require-media-caption.js

@@ -56,8 +56,7 @@ module.exports = {
 
           // Any other dynamic value (e.g. muted="{{isMuted}}" → ConcatStatement,
           // or muted={{#if ...}}...{{/if}} → BlockStatement) → treat as exempt.
-          // Matches upstream ember-template-lint behavior where MustacheStatement,
-          // BlockStatement, or any non-text/non-"false" value is considered muted.
+          // These cannot be statically evaluated, so assume the element may be muted.
           if (value.type !== 'GlimmerTextNode' && value.type !== 'GlimmerMustacheStatement') {
             return;
           }