Tweak other fixture instructions

fixtures/unstable-async/time-slicing/README.md

@@ -4,23 +4,26 @@
 
 This is a demo application based on [Dan Abramov's](https://github.com/gaearon) recent [JSConf Iceland talk](https://reactjs.org/blog/2018/03/01/sneak-peek-beyond-react-16.html) about React.
 
-It depends on a local build of React and enables us to easily test async and "suspense" APIs in a more "real world app" like context.
+It depends on a local build of React and enables us to easily test async "time slicing" APIs in a more "real world app" like context.
 
 ## Can I use this code in production?
 
 No. The APIs being tested here are unstable and some of them have still not been released to NPM. For now, this fixture is only a test harness.
 
+There are also known bugs and inefficiencies in master so **don't use this fixture for demonstration purposes either yet**. Until they are fixed, this fixture is **not** indicative of React async rendering performance.
+
 ## How do I run this fixture?
 
 ```shell
 # 1: Build react from source
 cd /path/to/react
-yarn build -- dom,core,interaction,simple-cache-provider type=NODE
+yarn
+yarn build dom,core,interaction,simple-cache-provider --type=NODE
 
 # 2: Install fixture dependencies
-cd ./fixtures/suspense/cpu/
-yarn install
+cd fixtures/unstable-async/time-slicing/
+yarn
 
 # 3: Run the app
 yarn start
-```
+```