docs: fix pycasbin-redis-watcher

[Nekotoxin]

@hsluoyz plz review

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[casbin-bot]

@tangyang9464 @JalinWang @imp2002 please review

[hsluoyz]

@Nekotoxin don't remove the old one. You can put it before theirs

[Nekotoxin]

@hsluoyz ok changed