BUR #22828 has been approved by @nonamethanks.
rename okita_souji_(isshin) -> okita_souji_(ishin)
rename sakamoto_ryoma_(isshin) -> sakamoto_ryouma_(ishin)
rename okada_izo_(ryuu_ga_gotoku_isshin) -> okada_izou_(ishin)
Consistency between transcription and disambiguation, along with correcting a typo.