Minor typos in librispeech transducer recipe.

[whsqkaak]

Hello

I found some minor typos in Librispeech transducer recipe.

icefall/egs/librispeech/ASR/transducer/decoder.py

Lines 92 to 94 in 5b6699a

	embeding_out = self.embedding(y)
	embeding_out = self.embedding_dropout(embeding_out)
	rnn_out, (h, c) = self.rnn(embeding_out, states)

icefall/egs/librispeech/ASR/transducer_lstm/decoder.py

Lines 96 to 98 in 1d44da8

	embeding_out = self.embedding(y)
	embeding_out = self.embedding_dropout(embeding_out)
	rnn_out, (h, c) = self.rnn(embeding_out, states)

icefall/egs/yesno/ASR/transducer/decoder.py

Lines 87 to 89 in 95af039

	embeding_out = self.embedding(y)
	embeding_out = self.embedding_dropout(embeding_out)
	rnn_out, (h, c) = self.rnn(embeding_out, states)

I think embeding_out must be changed to embedding_out.

[csukuangfj]

Yes, you are right. Please make a PR if you have time.

[csukuangfj]

Closing via #329