Yieldlab Adapter: update media_types docs (#3363)

* Add Supply Chain Support to Docs

* Yl-3989: Update media_types: video, banner, native

Co-authored-by: Mirko Feddern <m.feddern@yieldlab.de>
Co-authored-by: Christoph <29540638+kippsterr@users.noreply.github.com>

dev-docs/bidders/yieldlab.md

@@ -3,7 +3,7 @@ layout: bidder
 title: Yieldlab
 description: Prebid Yieldlab Bidder Adapter
 biddercode: yieldlab
-media_types: video
+media_types: video, banner, native
 gdpr_supported: true
 schain_supported: true
 userIds: britepoolId, criteo, id5Id, identityLink, liveIntentId, netId, parrableId, pubCommonId, unifiedId