also add the step to navigation preload

Author: yoshisatoyanagisawa

docs/index.bs

@@ -3303,6 +3303,7 @@ spec: storage; urlPrefix: https://storage.spec.whatwg.org/
 
                   To [=fetch/processResponse=] for |navigationPreloadResponse|, run these substeps:
 
+                  1. If |fetchController|'s [=fetch controller/state=] is "<code>terminated</code>" or "<code>aborted</code>", abort these steps.
                   1. If |navigationPreloadResponse|'s [=response/type=] is "`error`", reject |preloadResponse| with a `TypeError` and terminate these substeps.
                   1. Associate |preloadResponseObject| with |navigationPreloadResponse|.
                   1. Resolve |preloadResponse| with |preloadResponseObject|.