add introduction of fst hotwords

雾聪

2024-01-01 f047ff8aa4fb11215a3eb5a425fee77ff72e5dba

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st    street
st    saint
dr    doctor
dr    drive
mt    mount
sr    senior
prof    professor
mt    mountain
sr    senior
jr    junior
vol    volume
rd    road
ave    avenue
approx    approximately