Update fetch.bs

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

Author: noamr

fetch.bs

@@ -6883,7 +6883,7 @@ top-level document itself, the entire 128 kibibytes delegated quota is collected
 pool of 640 kibibytes.
 
 <p>Out of the allocated quota for a <a for=/>document</a>, only 64 kibibytes can be used
-concurrently for the same reporting origin (the <a for=/>request</a>'s <a for=request>URL</a>'
+concurrently for the same reporting origin (the <a for=/>request</a>'s <a for=request>URL</a>'s
 <a for=url>origin</a>). This prevents a situation where particular 3rd party libraries would reserve
 quota opportunistically, before they have data to send.