docs: clean up the channel documentation
docs: clean up the channel documentation

hustxiaoc/tchannel,vanloswang/tchannel,benfleis/tchannel,i/tchannel,chenwenbin928/tchannel,Zirpon/tchannel,RyanTech/tchannel,bunnyblue/tchannel,sasa233/tchannel,benfleis/tchannel,savaki/tchannel,hustxiaoc/tchannel,vanloswang/tchannel,RyanTech/tchannel,chenwenbin928/tchannel,sasa233/tchannel,chenwenbin928/tchannel,bunnyblue/tchannel,bunnyblue/tchannel,savaki/tchannel,RyanTech/tchannel,benfleis/tchannel,vanloswang/tchannel,i/tchannel,Zirpon/tchannel,Zirpon/tchannel,hustxiaoc/tchannel,sasa233/tchannel,savaki/tchannel,i/tchannel