doc: update the image to show the `profile` option in graph plugin (#5978)
doc: update the image to show the `profile` option in graph plugin (#5978)

To prevent the confusion of the [graph plugin profile option](https://www.tensorflow.org/tensorboard/graphs#graphs_of_tffunctions)
versus the [profiler plugin](https://www.tensorflow.org/tensorboard/tensorboard_profiling_keras).
tensorflow/tensorboard,tensorflow/tensorboard,tensorflow/tensorboard,tensorflow/tensorboard,tensorflow/tensorboard,tensorflow/tensorboard,tensorflow/tensorboard