added docs for the prev auction info module

[jlquaccia]

• Documentation for the new Previous Auction Info module

🏷 Type of documentation

• new feature

📋 Checklist

• Related pull requests in prebid.js or server are linked -> Paste link in this list or reference it on the PR itself

Relative links

• PR: New Module: MinBidToWin Notifications: Created a new module to support sending minbidtowin notifications to bidders Prebid.js#11086
• GH Issue: Prebid.js client side loss notifications, adding info to future events or own event? Prebid.js#10788

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[pm-harshad-mane]

@jlquaccia can you pease work on getting this PR merged?

[jlquaccia]

Fixed some linting errors that were present and also rebased on top of master. @ChrisHuie @dgirardi could one of you guys review when you have a chance?