Editorial: Remove/clean up some informative text

Author: littledan

index.bs

@@ -12393,11 +12393,11 @@ Issue: The relevant |this| value is not always well-defined; see
     The set of interfaces that a [=platform object=] [=implements=] does not change over
     the lifetime of the object.
 
-    Multiple [=interface objects=] associated with different [=Realm/global objects=]
-    will allocate [=platform objects=] which have \[[PrimaryInterface]] internal
-    slots referencing the same underlying [=interface=]. For example, a page may
-    contain a same-origin iframe, with the iframe's method being called on the
-    main page's element of the same kind, with no exception thrown.
+    Multiple [=platform objects=] with different [=Realm/global objects=] will share
+    a reference to the same [=interface=] in their \[[PrimaryInterface]] internal
+    slots. For example, a page may contain a same-origin iframe, with the iframe's
+    method being called on the main page's element of the same kind, with no exception
+    thrown.
 
     [=Interface mixins=] do not participate directly in the evaluation of the [=implements=]
     algorithm. Instead, each [=interface=] that the [=interface mixin=] is [=included=] in
@@ -12410,9 +12410,7 @@ Issue: The relevant |this| value is not always well-defined; see
 The <dfn id="dfn-primary-interface" export>primary interface</dfn> of a platform object
 that [=implements=] one or more interfaces is the value of the object's
 \[[PrimaryInterface]] internal slot, which is is the most-derived [=interface=]
-that it [=implements=].  The value of the \[[Prototype]] [=internal slot=]
-of the platform object is the [=interface prototype object=]
-of the [=primary interface=] from the [=platform object=]’s associated global environment.
+that it [=implements=].
 
 The global environment that a given [=platform object=]
 is associated with can <dfn id="dfn-change-global-environment" for="global environment" export>change</dfn> after it has been created.  When