Remove references to deprecated DefaultDataSourceFactory from dev guide

#minor-release

PiperOrigin-RevId: 436997521

libraries/datasource_cronet/README.md

@@ -38,8 +38,9 @@ If your application only needs to play http(s) content, using the Cronet
 extension is as simple as updating `DataSource.Factory` instantiations in your
 extension is as simple as updating `DataSource.Factory` instantiations in your
 application code to use `CronetDataSource.Factory`. If your application also
 application code to use `CronetDataSource.Factory`. If your application also
 needs to play non-http(s) content such as local files, use:
 needs to play non-http(s) content such as local files, use:
+
 ```
 ```
-new DefaultDataSourceFactory(
+new DefaultDataSource.Factory(
     ...
     ...
     /* baseDataSourceFactory= */ new CronetDataSource.Factory(...) );
     /* baseDataSourceFactory= */ new CronetDataSource.Factory(...) );
 ```
 ```

libraries/datasource_rtmp/README.md

@@ -39,7 +39,7 @@ injected from application code.
 
 
 `DefaultDataSource` will automatically use the RTMP extension whenever it's
 `DefaultDataSource` will automatically use the RTMP extension whenever it's
 available. Hence if your application is using `DefaultDataSource` or
 available. Hence if your application is using `DefaultDataSource` or
-`DefaultDataSourceFactory`, adding support for RTMP streams is as simple as
+`DefaultDataSource.Factory`, adding support for RTMP streams is as simple as
 adding a dependency to the RTMP extension as described above. No changes to your
 adding a dependency to the RTMP extension as described above. No changes to your
 application code are required. Alternatively, if you know that your application
 application code are required. Alternatively, if you know that your application
 doesn't need to handle any other protocols, you can update any
 doesn't need to handle any other protocols, you can update any