fix: When maybe collecting body only the pending flag should unconditionally be set

Author: juliandescottes

index.bs

@@ -6652,11 +6652,11 @@ To <dfn>maybe collect network response body</dfn> given |sessions|, |request| an
 
       1. [=Allocate size to record data=] given |size|.
 
-1. Set |collected data|'s <code>bytes</code> to |bytes|.
+      1. Set |collected data|'s <code>bytes</code> to |bytes|.
 
-1. Set |collected data|'s <code>pending</code> to false.
+      1. Set |collected data|'s <code>size</code> to |size|.
 
-1. Set |collected data|'s <code>size</code> to |size|.
+1. Set |collected data|'s <code>pending</code> to false.
 
 1. [=Resume=] with "<code>network data collected</code>" and (|request|'s [=request id=], "response").