Update fetch.bs

Co-authored-by: Anne van Kesteren <[email protected]>

Author: noamr

fetch.bs

@@ -9086,8 +9086,8 @@ method steps are:
 
  <li><p>If <var>activateAfter</var> is less than 0, then throw a {{RangeError}}.
 
- <li><p>If <var>request</var>'s <a for=request>window</a>'s <a>associated document</a> is not a
- <a>fully active</a> <a for=/>document</a>, then throw a {{TypeError}}.
+ <li><p>If <var>request</var>'s <a for=request>window</a>'s <a>associated document</a> is not
+ <a>fully active</a>, then throw a {{TypeError}}.
 
  <li><p>If <var>request</var>'s <a for=request>URL</a>'s <a for=url>scheme</a> is not an
  <a>HTTP(S) scheme</a>, then throw a {{TypeError}}.