Update metrics.md
Update metrics.md

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