added a prebid server params section to the Sonobi bidder docs - issue …

…prebid#1063 (prebid#4804)

dev-docs/bidders/sonobi.md

@@ -44,3 +44,10 @@ The `ad_unit` and `placement_id` are **mutually exclusive** but at least one is
 If you pass the optional `sizes` Array in your bid params it will override the global config sizes for the Sonobi Adapter only.
 
 The `hfa` parameter requires your Sonobi Account Manager to enable this feature for you. Please contact them for further information.
+
+### Prebid Server Bid Params
+
+{: .table .table-bordered .table-striped }
+| Name | Scope | Description | Example | Type |
+|---------------|----------|-----------------------|-----------|-----------|
+| `TagID` | required | The placement ID or The adunit ID | `'1a2b3c4d5e6f1a2b3c4d' or '/1234567/example/adUnit/code'` | `string` |