Address more annevk comments

Author: meacer

fetch.bs

@@ -2160,14 +2160,13 @@ Unless stated otherwise, it is false.
 <p>A <a for=/>request</a> has an associated boolean <dfn export for=request>is HTTPS upgrade</dfn>.
 Unless stated otherwise, it is false.
 
-<p class=note>This flag is for exclusive use by HTTPS Upgrading algorithm.
+<p class=note>This is for exclusive use by HTTPS Upgrading algorithm.
 
-<p>A <a for=/>request</a> has an associated <dfn export for=request>HTTPS upgrade fallback URL</dfn>,
-which is a <a for=/>URL</a>. It is a copy of the <a for=/>request</a>'s original
-<a for=request>URL</a> before <a for=/>request</a> is <a href="#https-upgrades-upgrade">optionally
-upgraded to HTTPS</a>. Unless stated otherwise, it is unset.
+<p>A <a for=/>request</a> has an associated
+<dfn export for=request>HTTPS upgrade fallback URL</dfn>, which is a <a for=/>URL</a>. Unless
+otherwise stated, it is null.
 
-<p class=note>This flag is for exclusive use by HTTPS Upgrading algorithm.
+<p class=note>This is for exclusive use by HTTPS Upgrading algorithm.
 
 <hr>