Editorial: scheme is not a standalone type

Remove more instances where a concept member is used as a type.

Author: annevk

fetch.bs

@@ -279,19 +279,19 @@ number.
 
 <h3 id=url>URL</h3>
 
-<p>A <dfn export>local scheme</dfn> is a <a for=url>scheme</a> that is "<code>about</code>",
-"<code>blob</code>", or "<code>data</code>".
+<p>A <dfn export>local scheme</dfn> is "<code>about</code>", "<code>blob</code>", or
+"<code>data</code>".
 
 <p>A <a for=/>URL</a> <dfn export>is local</dfn> if its <a for=url>scheme</a> is a
 <a>local scheme</a>.
 
 <p class=note>This definition is also used by <cite>Referrer Policy</cite>. [[REFERRER]]
 
-<p>An <dfn export id=http-scheme>HTTP(S) scheme</dfn> is a <a for=url>scheme</a> that is
-"<code>http</code>" or "<code>https</code>".
+<p>An <dfn export id=http-scheme>HTTP(S) scheme</dfn> is "<code>http</code>" or
+"<code>https</code>".
 
-<p>A <dfn export>fetch scheme</dfn> is a <a for=url>scheme</a> that is "<code>about</code>",
-"<code>blob</code>", "<code>data</code>", "<code>file</code>", or an <a>HTTP(S) scheme</a>.
+<p>A <dfn export>fetch scheme</dfn> is "<code>about</code>", "<code>blob</code>",
+"<code>data</code>", "<code>file</code>", or an <a>HTTP(S) scheme</a>.
 
 <p class="note no-backref"><a>HTTP(S) scheme</a> and <a>fetch scheme</a> are also used by
 <cite>HTML</cite>. [[HTML]]
@@ -2810,7 +2810,7 @@ run these steps:
 request <a for=/>header</a> indicates where a
 <a for=/>fetch</a> originates from.
 
-<p class="note no-backref">The `<a http-header><code>Origin</code></a>` header is a version of the
+<p class=note>The `<a http-header><code>Origin</code></a>` header is a version of the
 `<code>Referer</code>` [sic] header that does not reveal a <a for=url>path</a>. It is used for all
 <a lt="HTTP fetch">HTTP fetches</a> whose <a for=/>request</a>'s
 <a for=request>response tainting</a> is "<code>cors</code>", as well as those where