RTB House Bid Adapter: add channel as an optional param #7879 (#3486)
RTB House Bid Adapter: add channel as an optional param #7879 (#3486)

* RTBHouse Bid Adapter: adds channel as optional param, updates bidder flags

* RTBHouse Bid Adapter: fixed table descriptions

* RTBHouse Bid Adapter: minor textual changes on bidder docs
prebid/prebid.github.io,prebid/prebid.github.io,prebid/prebid.github.io