Use normalize-newlines algorithm for the title attribute

As discovered in #10339 this matches the status quo.

source

@@ -13310,8 +13310,8 @@ Transport Protocol">HTTP&lt;/abbr> today.&lt;/p></code></pre> <!-- DO NOT REWRAP
   empty string, then there is no advisory information.</p>
 
   <ol>
-   <li><p>If the element has a <code data-x="attr-title">title</code> attribute, then return its
-   value.</p></li>
+   <li><p>If the element has a <code data-x="attr-title">title</code> attribute, then return the
+   result of running <span>normalize newlines</span> on its value.</p></li>
 
    <li><p>If the element has a parent element, then return the parent element's <span>advisory
    information</span>.</p></li>