fix typo (maybe) for ipython notebook demo

[steins024]

what

Fix a small bug for ipython notebook demo

why

Apply bpe failed, source file not exist, maybe a typo

In the code several lines below, it consumes "/tmp/sentences" as source file

applybpe /tmp/sentences.bpe /tmp/sentences

But here it write sentences into "/tmp/sentences.bpe"

with open('/tmp/sentences.bpe', 'w') as fwrite:

change:

Write sentences into "/tmp/sentences":

with open('/tmp/sentences', 'w') as fwrite:

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[giove91]

I agree.