improve the documentation for the eager connect and inactive listener code

[moodysalem]

https://github.com/Uniswap/uniswap-interface/blob/a6342d40f10957b0f65425b8a90be766e8be842b/src/hooks/web3.ts#L52-L94

currently i'm not sure why this code is calling activate when chain or accounts changed, trying to debug the walletconnect issue