Mark AdminNotification, Multishipping and other blocks as API

[sivaschenko]

The following blocks should be marked as API in 2.5-develop branch

1. Magento\AdminNotification\Block\Window
2. Magento\AdminNotification\Block\ToolbarEntry
3. Magento\AdminNotification\Block\System\Messages\UnreadMessagePopup
4. Magento\GoogleAdwords\Block\Code
5. Magento\GoogleOptimizer\Block\Code\Product
6. Magento\GoogleOptimizer\Block\Code\Category
7. Magento\Marketplace\Block\Partners
8. Magento\Multishipping\Block\Checkout\Addresses
9. Magento\Multishipping\Block\Checkout\Results
10. Magento\Multishipping\Block\Checkout\Overview
11. Magento\Multishipping\Block\Checkout\Billing
12. Magento\Multishipping\Block\Checkout\Success
13. Magento\Multishipping\Block\Checkout\Link
14. Magento\Multishipping\Block\Checkout\Shipping
15. Magento\Multishipping\Block\Checkout\Billing\Items
16. Magento\Multishipping\Block\Checkout\Address\Select
17. Magento\Sitemap\Block\Robots
18. Magento\Ups\Block\Backend\System\CarrierConfig

[m2-assistant]

Hi @sivaschenko. Thank you for your report.
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[vlmed]

@magento i am working on this

[vlmed]

@magento i am working on this