message: Reword exception message for failed AutoGraph conversion
diff: @@ -333,7 +333,9 @@ def converted_call(f, owner, options, args, kwargs):
  raise
  logging.warn(
  - 'Entity %s could not be transformed and will be staged without change.'
  + 'Entity %s could not be transformed and will be executed as-is.'
  + ' Some features (e.g. tensor-dependent conditionals and loops) may not'
  + ' work as expected.'
  ' Error details can be found in the logs when running with the env'
  ' variable AUTOGRAPH_VERBOSITY >= 1. Please report this to the'
  ' AutoGraph team. Cause: %s', target_entity, e)
  