Change "validate the response" to "process the response" to match HTML

See whatwg/html#1003.

spec/service_worker/index.bs

@@ -218,7 +218,7 @@ spec: html; urlPrefix: https://html.spec.whatwg.org/multipage/
             text: script; url: concept-script
             text: set up the request; url: fetching-scripts-set-up-request
             text: task queue; for: event loop
-            text: validate the response; url: fetching-scripts-validate-response
+            text: process the response; url: fetching-scripts-process-response
         urlPrefix: workers.html
             text: get a fetch result
             text: https state
@@ -3167,7 +3167,7 @@ spec: webidl; urlPrefix: https://heycam.github.io/webidl/
             <p class="note">Even if the cache mode is not set to "reload", the user agent obeys Cache-Control header's max-age value in the network layer to determine if it should bypass the browser cache.</p>
           </li>
         </ol>
-        <p>To <a>validate the response</a> given <var>response</var>, run the following steps:</p>
+        <p>To <a>process the response</a> given <var>response</var>, run the following steps:</p>
         <ol>
           <li><a>Extract a MIME type</a> from the <var>response</var>'s <a for="response">header list</a>. If this MIME type (ignoring parameters) is not one of <code>text/javascript</code>, <code>application/x-javascript</code>, and <code>application/javascript</code>, then:
             <ol>