message: Add --config=v2 to build-from-source documentation and configure.py.
diff: @@ -1582,6 +1582,7 @@ def main():
  config_info_line(
  'dynamic_kernels',
  '(Experimental) Build kernels into separate shared objects.')
  + config_info_line('v2', 'Build TensorFlow 2.x instead of 1.x.')
  print('Preconfigured Bazel build configs to DISABLE default on features:')
  config_info_line('noaws', 'Disable AWS S3 filesystem support.')
  