Reverting skip-sw-flag change

Author: jakearchibald

docs/index.bs

@@ -2852,7 +2852,7 @@ spec: webappsec-referrer-policy; urlPrefix: https://w3c.github.io/webappsec-refe
               1. Let |preloadRequestHeaders| be |preloadRequest|'s [=request/header list=].
               1. Let |preloadResponseObject| be a new {{Response}} object and a new associated {{Headers}} object whose [=guard=] is "`immutable`".
               1. [=header list/Append=] to |preloadRequestHeaders| a new [=header=] whose [=header/name=] is \`<code>Service-Worker-Navigation-Preload</code>\` and [=header/value=] is |registration|'s [=navigation preload header value=].
-              1. Set |preloadRequest|'s [=service-workers mode=] to "`none`".
+              1. Set |preloadRequest|'s [=skip-service-worker flag=].
               1. Run the following substeps [=in parallel=]:
                   1. [=Fetch=] |preloadRequest|.