fix

Author: yutakahirano

fetch.bs

@@ -1753,7 +1753,7 @@ for reporting</dfn>, given a <a for=/>request</a> <var>request</var>, run these
 
 <ol>
  <li>
-  <p>Let <var>url</var> be <var>request</var>'s <a for=request>URL</a>.
+  <p>Let <var>url</var> be a copy of <var>request</var>'s <a for=request>URL</a>.
 
   <p class="note">This is not <var>request</var>'s <a for=request>current URL</a> in order to avoid
   leaking information about redirect targets (see