add missing bracket

Author: carlosjoan91

fetch.bs

@@ -4409,7 +4409,7 @@ steps:
  <li><p><a>Upgrade <var>request</var> to a potentially trustworthy URL, if appropriate</a>.
 
  <li><p>If <var>request</var> is a <a>navigation request</a> whose <a for=request>destination</a>
- is "<code>document</code, <var>request</var>'s <a for=request>method</a> is <code>GET</code>,
+ is "<code>document</code>, <var>request</var>'s <a for=request>method</a> is <code>GET</code>,
  and <var>request</var>'s <a for=request>URL</a> is not a <a>potentially trustworthy URL</a>,
  optionally upgrade it to a <a>potentially trustworthy URL<a>. If <var>request</var> is upgraded,
  set <var>request</var>'s <a for=request>https-upgrade</a> flag to true.