Fix content resizing example (#2759)

Removed an accidental project i pushed 😬 
also fixed the bash commands in the readme

## Pre-launch Checklist

- [x] I read the [Flutter Style Guide] _recently_, and have followed its
advice.
- [x] I signed the [CLA].
- [x] I read the [Contributors Guide].
- [x] I have added sample code updates to the [changelog].
- [x] I updated/added relevant documentation (doc comments with `///`).

add_to_app/ios_content_resizing/README.md

@@ -18,8 +18,6 @@ you're building for both iOS and Android, with both toolchains installed):
 
   cd flutter_module/
   flutter pub get
-
-  # For iOS builds:
   cd ../ios_content_resizing
   pod install
   open ios_content_resizing.xcworkspace