Nativo: Fix Documentation (#6006)

* Added nativo markup documentation to dev-docs/bidders

* Added IAB Global Vendor List ID number.

* Adjusted placementId Type to be integer

* Changed pbjs value to true

* Added optional url parameter

* Updated placementId parameter to be optional

* Added userIds to nativo.md

* Reflecting Prebid Server Adapter metadata

* Update nativo bidder docs

* Add multiformat_supported field to nativo readme

* Nativo: updated documentation

* Nativo: Documentation Update

* Nativo: Documentation Update - after code review.

* Nativo: Fix on Prebid.js param table not rendering correctly

---------

Co-authored-by: Josh <jfledd@gmail.com>
Co-authored-by: jsfledd <jsfledd@users.noreply.github.com>
Co-authored-by: Joshua Fledderjohn <jfledderjohn@nativo.com>
Co-authored-by: Bill Coloe <clowd150@gmail.com>
Co-authored-by: doctafaustus <bcoloe@nativo.com>

Author: 3 people

dev-docs/bidders/nativo.md

@@ -22,7 +22,7 @@ The Nativo Bidder adapter requires setup before beginning. Please contact us at
 
 ### Bid Params
 
-### Prebid Server
+#### Prebid Server
 
 Prebid Server primarily relies on the OpenRTB specification for its field definitions, along with widely recognized extensions that have become semi-standard within the industry.
 
@@ -33,9 +33,10 @@ Prebid Server primarily relies on the OpenRTB specification for its field defini
 | `imp.ext.nativo.placementid` | required if no tagID                | Refers to the unique Placement ID assigned by the Nativo platform.                                                         |  `12345678`                                         | `integer` |
 | `imp.ext.gpid`               | required if no other ID is provided | Represents the Ad Slot GP ID. It is another layer of identification tied to a placement ID within the Nativo platform. Read more about [gpid in the prebid docs](/features/pbAdSlot.html#the-gpid)       |  `/22888152279/publication/placement/gpid_example`  | `string`  |
 
-### Prebid JS
+#### Prebid JS
+
 {: .table .table-bordered .table-striped }
 | Name       | Scope    | Description                                                                            | Example                                         | Type      |
 |------------|----------|----------------------------------------------------------------------------------------|-------------------------------------------------|-----------|
 | `ntv_url`  | required | Publication url associated with placement IDs within the Nativo platform. |  `https://publication.com/prebid_adpater.html`  | `string`  |
-| `ntv_ptd`  | optional | Refers to a list of Placement IDs assigned by the Nativo platform for the publication. |  `12345678,12345699`                            | `array of integer` |
+| `ntv_ptd`  | optional | Refers to a list of Placement IDs assigned by the Nativo platform for the publication. |  `12345678,12345699`   | `array of integer` |