Document that apps must depend on a consistent module version

PiperOrigin-RevId: 385522972

README.md

@@ -52,6 +52,8 @@ implementation 'com.google.android.exoplayer:exoplayer-dash:2.X.X'
 implementation 'com.google.android.exoplayer:exoplayer-ui:2.X.X'
 implementation 'com.google.android.exoplayer:exoplayer-ui:2.X.X'
 ```
 ```
 
 
+When depending on individual modules they must all be the same version.
+
 The available library modules are listed below. Adding a dependency to the full
 The available library modules are listed below. Adding a dependency to the full
 ExoPlayer library is equivalent to adding dependencies on all of the library
 ExoPlayer library is equivalent to adding dependencies on all of the library
 modules individually.
 modules individually.

docs/hello-world.md

@@ -50,6 +50,8 @@ implementation 'com.google.android.exoplayer:exoplayer-ui:2.X.X'
 ~~~
 ~~~
 {: .language-gradle}
 {: .language-gradle}
 
 
+When depending on individual modules they must all be the same version.
+
 The available library modules are listed below. Adding a dependency to the full
 The available library modules are listed below. Adding a dependency to the full
 ExoPlayer library is equivalent to adding dependencies on all of the library
 ExoPlayer library is equivalent to adding dependencies on all of the library
 modules individually.
 modules individually.