Fix formatting for `appnexusAst` bidder params (#458)
Fix formatting for `appnexusAst` bidder params (#458)

Move nested bulleted lists into a table for ease of reading/scanning.
prebid/prebid.github.io,sonobi/prebid.github.io,prebid/prebid.github.io,sonobi/prebid.github.io,prebid/prebid.github.io,sonobi/prebid.github.io