Remove "r" from instructions for extension modules

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=188038757

extensions/cast/README.md

@@ -12,10 +12,10 @@ Cast receiver app.
 The easiest way to use the extension is to add it as a gradle dependency:
 
 ```gradle
-implementation 'com.google.android.exoplayer:extension-cast:rX.X.X'
+implementation 'com.google.android.exoplayer:extension-cast:2.X.X'
 ```
 
-where `rX.X.X` is the version, which must match the version of the ExoPlayer
+where `2.X.X` is the version, which must match the version of the ExoPlayer
 library being used.
 
 Alternatively, you can clone the ExoPlayer repository and depend on the module

extensions/gvr/README.md

@@ -12,10 +12,10 @@ of surround sound and ambisonic soundfields.
 The easiest way to use the extension is to add it as a gradle dependency:
 
 ```gradle
-implementation 'com.google.android.exoplayer:extension-gvr:rX.X.X'
+implementation 'com.google.android.exoplayer:extension-gvr:2.X.X'
 ```
 
-where `rX.X.X` is the version, which must match the version of the ExoPlayer
+where `2.X.X` is the version, which must match the version of the ExoPlayer
 library being used.
 
 Alternatively, you can clone the ExoPlayer repository and depend on the module

extensions/ima/README.md

@@ -12,10 +12,10 @@ alongside content.
 The easiest way to use the extension is to add it as a gradle dependency:
 
 ```gradle
-implementation 'com.google.android.exoplayer:extension-ima:rX.X.X'
+implementation 'com.google.android.exoplayer:extension-ima:2.X.X'
 ```
 
-where `rX.X.X` is the version, which must match the version of the ExoPlayer
+where `2.X.X` is the version, which must match the version of the ExoPlayer
 library being used.
 
 Alternatively, you can clone the ExoPlayer repository and depend on the module

extensions/leanback/README.md

@@ -11,10 +11,10 @@ ExoPlayer.
 The easiest way to use the extension is to add it as a gradle dependency:
 
 ```gradle
-implementation 'com.google.android.exoplayer:extension-leanback:rX.X.X'
+implementation 'com.google.android.exoplayer:extension-leanback:2.X.X'
 ```
 
-where `rX.X.X` is the version, which must match the version of the ExoPlayer
+where `2.X.X` is the version, which must match the version of the ExoPlayer
 library being used.
 
 Alternatively, you can clone the ExoPlayer repository and depend on the module

extensions/mediasession/README.md

@@ -12,10 +12,10 @@ behaviour can be extended to support other playback and custom actions.
 The easiest way to use the extension is to add it as a gradle dependency:
 
 ```gradle
-implementation 'com.google.android.exoplayer:extension-mediasession:rX.X.X'
+implementation 'com.google.android.exoplayer:extension-mediasession:2.X.X'
 ```
 
-where `rX.X.X` is the version, which must match the version of the ExoPlayer
+where `2.X.X` is the version, which must match the version of the ExoPlayer
 library being used.
 
 Alternatively, you can clone the ExoPlayer repository and depend on the module

extensions/okhttp/README.md

@@ -19,10 +19,10 @@ licensed separately.
 The easiest way to use the extension is to add it as a gradle dependency:
 
 ```gradle
-implementation 'com.google.android.exoplayer:extension-okhttp:rX.X.X'
+implementation 'com.google.android.exoplayer:extension-okhttp:2.X.X'
 ```
 
-where `rX.X.X` is the version, which must match the version of the ExoPlayer
+where `2.X.X` is the version, which must match the version of the ExoPlayer
 library being used.
 
 Alternatively, you can clone the ExoPlayer repository and depend on the module

extensions/rtmp/README.md

@@ -20,10 +20,10 @@ Android, which is licensed separately.
 The easiest way to use the extension is to add it as a gradle dependency:
 
 ```gradle
-implementation 'com.google.android.exoplayer:extension-rtmp:rX.X.X'
+implementation 'com.google.android.exoplayer:extension-rtmp:2.X.X'
 ```
 
-where `rX.X.X` is the version, which must match the version of the ExoPlayer
+where `2.X.X` is the version, which must match the version of the ExoPlayer
 library being used.
 
 Alternatively, you can clone the ExoPlayer repository and depend on the module