Remove false positive

issues/fenced-frame-brokenlinks.md

@@ -5,7 +5,6 @@ Title: Broken references in Fenced Frame
 ---
 
 While crawling [Fenced Frame](https://wicg.github.io/fenced-frame/), the following links to other specifications were detected as pointing to non-existing anchors:
-* [ ] https://html.spec.whatwg.org/#sandboxing:active-sandboxing-flag-set-3
 * [ ] https://html.spec.whatwg.org/multipage/document-sequences.html#creator-base-url
 
 <sub>This issue was detected and reported semi-automatically by [Strudy](https://github.com/w3c/strudy/) based on data collected in [webref](https://github.com/w3c/webref/).</sub>