Configuration behavior docs

[timkimadobe]

Is there an existing issue for this?

• I have searched the existing issues

What's missing?

Configuration should have behavior docs that explain how remote configs are downloaded, including some hidden behavior like the 15 sec minimum redownload window:
https://github.com/adobe/aepsdk-core-ios/blob/c3727f6b2a25a8e395ee71d42d1671e12851db84/AEPCore/Sources/configuration/Configuration.swift#L135-L138