test: change Fixes: to Refs:

Tests don't fix things generally, so use "Refs:" to refer people to
GitHub issues.

PR-URL: #34568
Reviewed-By: Richard Lau <riclau@uk.ibm.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>

test/parallel/test-fs-symlink.js

@@ -53,7 +53,7 @@ fs.symlink(linkData, linkPath, common.mustSucceed(() => {
   }));
 
   tmpdir.refresh();
-  // Fixes: https://github.com/nodejs/node/issues/34514
+  // Refs: https://github.com/nodejs/node/issues/34514
   fs.symlinkSync(Buffer.from(linkData), linkPath);
 }));