Update README files.

MediaStore/README.md

@@ -6,7 +6,7 @@ Android Media Store Sample
 <img src="screenshots/icon-web.png" height="256" alt="App Icon"/>
 </div>
 
-This sample demonstrates how to use Android's [MediaStore][#4] to locate and display the users
+This sample demonstrates how to use Android's [MediaStore][4] to locate and display the users
 images in a RecyclerView.
 
 Introduction

README.md

@@ -1,16 +1,8 @@
-Storage Samples Repository
-=====================
+# Storage Samples Repository
 
 This repository contains a set of individual Android Studio projects to help you learn about
 storage in Android (saving files in storage, key-value data, sharing simple data, sharing files,
 printing files, content providers, Storage Access Framework [SAF], etc.).
 
 For more information, please [read our documentation](https://developer.android.com/guide/topics/providers/document-provider)
 
-Samples
--------
-[ActionOpenDocument](ActionOpenDocument/): A sample PDF viewer app that demonstrates the use of
-`Intent.ACTION_OPEN_DOCUMENT`.
-
-[ActionOpenDocumentTree](ActionOpenDocumentTree/): An example file manager app that utilizes
-`Intent.ACTION_OPEN_DOCUMENT_TREE` to allow a user to browse and open files.