rpc: discovery to return correct link for methods' externalDocs

[ziogaschr]

Calling the rpc_discover gives wrong links to our repo codebase.

System information

CoreGeth
Version: 1.11.21-unstable
Architecture: amd64
Protocol Versions: [65 64 63]
Go Version: go1.15.5
Operating System: darwin
GOPATH=/Users/ziogaschr/Sites/go
GOROOT=/usr/local/Cellar/go/1.15.5/libexec

Expected behaviour

To point at our repo etclabscore/core-geth

"externalDocs": {
        "description": "Github remote link",
        "url": "https://github.com/etclabscore/core-geth/blob/master/internal/ethapi/api.go#L2004"
      }

Actual behaviour

It points at Ethereum repo ethereum/go-ethereum

"externalDocs": {
        "description": "Github remote link",
        "url": "https://github.com/ethereum/go-ethereum/blob/master/internal/ethapi/api.go#L2004"
      }

[meowsbits]

Of note here is that github.com/etclabscore/core-geth is, for the purposes of go at least, declared as github.com/ethereum/go-ethereum (https://github.com/etclabscore/core-geth/blob/master/go.mod#L1)