fs-util: remove comment about non-existing function

src/basic/fs-util.c

@@ -621,10 +621,7 @@ int chase_symlinks(const char *path, const char *original_root, unsigned flags,
          * Suggested usage: whenever you want to canonicalize a path, use this function. Pass the absolute path you got
          * as-is: fully qualified and relative to your host's root. Optionally, specify the root parameter to tell this
          * function what to do when encountering a symlink with an absolute path as directory: prefix it by the
-         * specified path.
-         *
-         * Note: there's also chase_symlinks_prefix() (see below), which as first step prefixes the passed path by the
-         * passed root. */
+         * specified path. */
 
         if (original_root) {
                 r = path_make_absolute_cwd(original_root, &root);