update m2met docs

yhliang

2023-04-26 5a48c1cb7f0e13ec9828a9bf7845e684ee0a8d27

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beam_size: 10
penalty: 0.0
maxlenratio: 0.0
minlenratio: 0.0
ctc_weight: 1.0
lm_weight: 0.7