Editorial: align with URL's cannot-be-base-URL removal

These URLs now have a path whose value is a string rather than a list.

See whatwg/url#655 for context.

Author: annevk

fetch.bs

@@ -4214,12 +4214,12 @@ steps:
 <dl class=switch>
  <dt>"<code>about</code>"
  <dd>
-  <p>If <var>request</var>'s <a for=request>current URL</a>'s <a>cannot-be-a-base-URL</a> is true
-  and <a for=url>path</a> contains a single string "<code>blank</code>", then return a new
-  <a for=/>response</a> whose <a for=response>status message</a> is `<code>OK</code>`,
-  <a for=response>header list</a> consist of a single <a for=/>header</a> whose
-  <a for=header>name</a> is `<code>Content-Type</code>` and <a for=header>value</a> is
-  `<code>text/html;charset=utf-8</code>`, and <a for=response>body</a> is the empty byte sequence.
+  <p>If <var>request</var>'s <a for=request>current URL</a>'s <a for=url>path</a> is the string
+  "<code>blank</code>", then return a new <a for=/>response</a> whose
+  <a for=response>status message</a> is `<code>OK</code>`, <a for=response>header list</a> consist
+  of a single <a for=/>header</a> whose <a for=header>name</a> is `<code>Content-Type</code>` and
+  <a for=header>value</a> is `<code>text/html;charset=utf-8</code>`, and <a for=response>body</a> is
+  the empty byte sequence.
 
   <p>Otherwise, return a <a>network error</a>.
 
@@ -6903,9 +6903,8 @@ constructor steps are:
       <p>If one of the following is true
 
       <ul class=brief>
-       <li><p><var>parsedReferrer</var>'s <a>cannot-be-a-base-URL</a> is true, <a for=url>scheme</a>
-       is "<code>about</code>", and <a for=url>path</a> contains a single string
-       "<code>client</code>"
+       <li><p><var>parsedReferrer</var>'s <a for=url>scheme</a> is "<code>about</code>" and
+       <a for=url>path</a> is the string "<code>client</code>"
 
        <li><p><var>parsedReferrer</var>'s <a for=url>origin</a> is not <a>same origin</a> with
        <var>origin</var>