Restore missing ejected banner

Summary:
A few more docs where the ejected metadata was lost in the autodocs flattening transition that happened in 9ec9567390.
Closes https://github.com/facebook/react-native/pull/16773

Differential Revision: D6286368

Pulled By: hramos

fbshipit-source-id: bb7c032ca386e473c393821ce031714168d31719

docs/running-on-device.md

@@ -4,6 +4,7 @@ title: Running On Device
 layout: docs
 category: Guides
 permalink: docs/running-on-device.html
+banner: ejected
 next: upgrading
 previous: integration-with-existing-apps
 ---

docs/running-on-simulator-ios.md

@@ -4,6 +4,7 @@ title: Running On Simulator
 layout: docs
 category: Guides (iOS)
 permalink: docs/running-on-simulator-ios.html
+banner: ejected
 next: communication-ios
 previous: linking-libraries-ios
 ---

docs/signed-apk-android.md

@@ -4,6 +4,7 @@ title: Generating Signed APK
 layout: docs
 category: Guides (Android)
 permalink: docs/signed-apk-android.html
+banner: ejected
 next: android-building-from-source
 previous: headless-js-android
 ---

docs/understanding-cli.md

@@ -4,6 +4,7 @@ title: Understanding the CLI
 layout: docs
 category: Contributing
 permalink: docs/understanding-cli.html
+banner: ejected
 next: activityindicator
 previous: testing
 ---