Refine argument to attachByName to limit possible class-string args…

… to descendants of `FilterInterface`

Signed-off-by: George Steel <[email protected]>

src/FilterChain.php

@@ -180,7 +180,7 @@ public function attach(FilterInterface|callable $callback, int $priority = self:
      * Retrieves the filter from the attached plugin manager, and then calls attach()
      * with the retrieved instance.
      *
-     * @param class-string|string $name
+     * @param class-string<FilterInterface>|string $name
      * @param  int $priority Priority at which to enqueue filter; defaults to 1000 (higher executes earlier)
      * @return self
      */