Update text_classification.ipynb

[vlc33]

I added aclImdb_v1/aclImbd in line 174 to get to the real dataset_directory otherwise next step (train) is not found.
Hope this helps it is my first fork here thx

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• site/en/tutorials/keras/text_classification.ipynb

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Format and style

Use the TensorFlow docs notebook tools to format for consistent source diffs and lint for style:

$ python3 -m pip install -U --user git+https://github.com/tensorflow/docs 
$ python3 -m tensorflow_docs.tools.nbfmt notebook.ipynb 
$ python3 -m tensorflow_docs.tools.nblint --arg=repo:tensorflow/docs notebook.ipynb 

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