fixup! review suggestions

packages/swingset-liveslots/src/vatDataTypes.d.ts

@@ -79,10 +79,10 @@ export type DefineKindOptions<C> = {
   stateShape?: StateShape;
 
   /**
-   * If a `receiveAmplifier` function is provided, it will be called during
-   * definition of the exo class kit with an `Amplify` function. If called
-   * during the definition of a normal exo or exo class, it will throw, since
-   * only exo kits can be amplified.
+   * If a `receiveAmplifier` function is provided to an exo class kit definition,
+   * it will be called with an `Amplify` function. If provided to the definition
+   * of a normal exo or exo class, the definition will throw, since only
+   * exo kits can be amplified.
    * An `Amplify` function is a function that takes a facet instance of
    * this class kit as an argument, in which case it will return the facets
    * record, giving access to all the facet instances of the same cohort.

packages/swingset-liveslots/src/virtualObjectManager.js

@@ -780,7 +780,7 @@ export const makeVirtualObjectManager = (
 
     if (!multifaceted) {
       receiveAmplifier === undefined ||
-        Fail`Only facets of an exo class kit can be amplified ${q(tag)}`;
+        Fail`Only facets of an exo class kit can be amplified, not ${q(tag)}`;
     }
 
     let facetNames;

packages/vat-data/test/test-amplify-virtual-class-kits.js

@@ -36,7 +36,8 @@ test('test amplify defineVirtualExoClass fails', t => {
         },
       ),
     {
-      message: 'Only facets of an exo class kit can be amplified "UpCounter"',
+      message:
+        'Only facets of an exo class kit can be amplified, not "UpCounter"',
     },
   );
 });