message: chore(MiscJSDoc): update import locations
diff: * we need these bogus classes, which are not stripped away. This file on the
  * other hand, is not included in the release bundle.
  */
  -import { TeardownLogic } from './Subscription';
  -import { Observable } from './Observable';
  +import { TeardownLogic } from './internal/Subscription';
  +import { Observable } from './internal/Observable';
  import './internal/observable/dom/MiscJSDoc';
  -import { Observer } from './Observer';
  +import { Observer } from './internal/Observer';
  /**
  * We need this JSDoc comment for affecting ESDoc.
  