doc: update -externalip documentation in tor.md
doc: update -externalip documentation in tor.md

Github-Pull: #19961
Rebased-From: a34eceb4cc054b4233e7321de927e8a7a2146301

litecoin-project/litecoin,qtumproject/qtum,rnicoll/dogecoin,qtumproject/qtum,litecoin-project/litecoin,rnicoll/dogecoin,litecoin-project/litecoin,rnicoll/dogecoin,qtumproject/qtum,qtumproject/qtum,rnicoll/dogecoin,qtumproject/qtum,litecoin-project/litecoin,qtumproject/qtum,litecoin-project/litecoin,litecoin-project/litecoin,rnicoll/dogecoin,qtumproject/qtum