Revert "Add explanation of vtable-as-brand for exotic objects"

This reverts commit 69a884b.

spec.html

@@ -8846,9 +8846,7 @@ <h1>CreateBuiltinFunction ( _steps_, _internalSlotsList_ [ , _realm_ [ , _protot
 
   <emu-clause id="sec-built-in-exotic-object-internal-methods-and-slots">
     <h1>Built-in Exotic Object Internal Methods and Slots</h1>
-    <p>This specification defines several kinds of built-in exotic objects. These objects generally behave similar to ordinary objects except for a few specific situations.</p>
-    <p>In some algorithms, there are steps of the form "If object is an X exotic object, ...", where X names a kind of exotic object such as Array, Bound Function, or Proxy. Each kind of exotic object is specified to have a particular collection of internal methods. A conformant implementation must provide X exotic objects and must recognize them as such by inspecting the object's internal methods. In other words, an implementation-provided exotic object that is behaviourally equivalent to an X exotic object but does not have the same collection of internal methods specified for X exotic objects is not recognized as an X exotic object.</p>
-    <p>The following exotic objects use the ordinary object internal methods except where it is explicitly specified otherwise below:</p>
+    <p>This specification defines several kinds of built-in exotic objects. These objects generally behave similar to ordinary objects except for a few specific situations. The following exotic objects use the ordinary object internal methods except where it is explicitly specified otherwise below:</p>
 
     <emu-clause id="sec-bound-function-exotic-objects">
       <h1>Bound Function Exotic Objects</h1>