Update fetch.bs

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

Author: noamr

fetch.bs

@@ -6863,7 +6863,7 @@ which is an algorithm that takes no arguments:
 
 <!-- non-normative -->
 <p>The deferred-fetch quota is allocated to a <a for=/>top-level traversable</a> (a "tab"),
-amounting to 640 kibibytes. The top-level {{Document}} and its same-origin directly nested documents
+amounting to 640 kibibytes. The top-level document and its same-origin directly nested documents
 can use this quota to queue deferred fetches, or delegate some of it to cross-origin nested
 documents, using permissions policy.