Fix explanatory comments in @ember/-internals/owner

packages/@ember/-internals/owner/index.ts

@@ -314,8 +314,8 @@ export function setOwner(object: object, owner: Owner): void {
 }
 
 // Defines the type for the ContainerProxyMixin. When we rationalize our Owner
-// *not* to work via mixins, we will be able to delete this entirely: this
-// overload for `lookup()` and all of `ownerInjection()` will go away.
+// *not* to work via mixins, we will be able to delete this entirely, in favor
+// of just using the Owner class itself.
 export interface ContainerProxy extends BasicContainer {
   /**
    Returns an object that can be used to provide an owner to a

packages/@ember/owner/index.ts

@@ -17,7 +17,9 @@
   - `Resolver`, an interface defining the contract for the object responsible
     for mapping string names to the corresponding classes. For example, when
     you write `@service('session')`, a resolver is responsible to map that back
-    to the `Session` service class in your codebase. Normally
+    to the `Session` service class in your codebase. Normally, this is handled
+    for you automatically with `ember-resolver`, which is the main implementor
+    of this interface.
 
   For more details on each, see their per-item docs!
 */