Mobile: Track burl and nurl in Rendering API

[OlenaPostindustria]

🏷 Type of documentation

• new bid adapter
• update bid adapter
• new feature
• text edit only (wording, typos)
• bugfix (code examples)
• new examples

Related issues:

• iOS: Enhance mobile tracking prebid-mobile-ios#1059

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[OlenaPostindustria]

@bretg, could you please update this diagram or provide with the source for it ? I'd like to modify sections 4c, 5b, and 6b to include information regarding the firing of burl and nurl

[bretg]

I shared all the source diagrams with you @OlenaPostindustria and @YuriyVelichkoPI