Bliink Bid Adapter Doc - Optional video url (#4778)

* fix: bliink.md updated

* fix(bliink doc) remove placement param

* fix(bliink doc) add optional imageUrl

* Bliink BidAdapter: Add new info to .md

* Bliink BidAdapter Doc: fix missing new line

---------

Co-authored-by: louisbillaut <louis@bliink.io>
Co-authored-by: samous <samuel.kerboeuf@gmail.com>

dev-docs/bidders/bliink.md

@@ -23,3 +23,4 @@ The BLIINK Header Bidding adaptor requires setup and approval from the BLIINK te
 |-------------|----------|----------------------------------|--------------------------------------|----------|
 | `tagId` | required | The TagID from BLIINK. | `'32'` | `string` |
 | `imageUrl` | optional | The image url on which the ad is displayed in case of in-image ad. | `'https://image.png'` | `string` |
+| `videoUrl` | optional | The Video url on which the ad is displayed in case of video ad. | `'https://video.mp4'` | `string` |