Add description of auto refresh case (#350)
Add description of auto refresh case (#350)

* Add description of auto refresh case

* update code example

* fix typo

prebid/prebid.github.io,sonobi/prebid.github.io,sonobi/prebid.github.io,sonobi/prebid.github.io,prebid/prebid.github.io,prebid/prebid.github.io