Delete notes about double normalization.

See whatwg#6624 (review)

source

@@ -56549,14 +56549,6 @@ fur
    <li><p>Return <var>list</var>.</p></li>
   </ol>
 
-  <p class="note">The newline conversions in this algorithm are necessary because some of the names
-  and string values reaching the <code>application/x-www-form-urlencoded</code> or <code
-  data-x="text/plain encoding algorithm">text/plain</code> serializers might not have been
-  previously normalized in the <span data-x="append an entry">appending the entry</span> algorithm,
-  and in fact no filenames have. That normalization is idempotent, so implementations are allowed to
-  keep track of which entries have been previously normalized in order to skip them in this
-  algorithm.</p>
-
   </div>
 
 
@@ -56593,12 +56585,6 @@ fur
      preceded by U+000D (CR), in <var>entry</var>'s value, by a string consisting of a U+000D (CR)
      and U+000A (LF).</p></li>
     </ol>
-
-    <p class="note">These newline conversions in this algorithm are necessary because some of the
-    names and string values in entry lists reaching this encoding algorithm might not have been
-    previously normalized in the <span data-x="append an entry">appending the entry</span>
-    algorithm. That normalization is idempotent, so implementations are allowed to keep track of
-    which entries have been previously normalized in order to skip them in this algorithm.</p>
    </li>
 
    <li>