Update now broken RFC links (#520)

ReSpec now references the `httpwg.org` versions of RFCs when they exist.
Unfortunately, these versions use different fragment identifiers.

Author: tidoust

Diff for: index.html

@@ -289,12 +289,12 @@ <h2>
         context of {{Promise}} objects are used as defined in [[!ECMASCRIPT]].
       </p>
       <p>
-        The terms <dfn data-cite="rfc9110#section-12.5.4">Accept-Language</dfn>
-        and <dfn data-cite="rfc9110#section-11">HTTP authentication</dfn> are
+        The terms <dfn data-cite="rfc9110#field.accept-language">Accept-Language</dfn>
+        and <dfn data-cite="rfc9110#authentication">HTTP authentication</dfn> are
         used as defined in [[!RFC9110]].
       </p>
       <p>
-        The term <dfn data-cite="rfc6265#section-5.3">cookie store</dfn> is
+        The term <dfn data-cite="rfc6265#storage-model">cookie store</dfn> is
         used as defined in [[!RFC6265]].
       </p>
       <p>