Fix #305: Update spec link for "sniffed type of a resource"

Changed in whatwg/mimesniff@ced82b8

Do not update HTML's use of the "sniffed" terminology, for now at least.

Part of #573

source

@@ -6615,10 +6615,10 @@ a.setAttribute('href', 'http://example.com/'); // change the content attribute d
   spec=MIMESNIFF></p>
 
   <p>The <dfn data-x="Content-Type sniffing"
-  data-x-href="https://mimesniff.spec.whatwg.org/#sniffed-mime-type">sniffed type of a resource</dfn>
-  must be found in a manner consistent with the requirements given in the MIME Sniffing
-  specification for finding the <i>sniffed media type</i> of the relevant sequence of octets. <ref
-  spec=MIMESNIFF></p>
+  data-x-href="https://mimesniff.spec.whatwg.org/#computed-mime-type">sniffed type of a
+  resource</dfn> must be found in a manner consistent with the requirements given in the MIME
+  Sniffing specification for finding the <i>sniffed media type</i> of the relevant sequence of
+  octets. <ref spec=MIMESNIFF></p>
 
   <p>The <dfn data-x="Content-Type sniffing: image"
   data-x-href="https://mimesniff.spec.whatwg.org/#rules-for-sniffing-images-specifically">rules for