[Backport] Fixed type hints and docs for Downloadable Samples block #16825
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Original Pull Request
#16408
Summary
Fixes type hints and PHPDocs in Magento\Downloadable\Block\Catalog\Product\Samples.
Description
In the block class unprecise type hints and PHPDocs are provided. Instead of Magento\Downloadable\Model\ResourceModel\Sample the method getSampleUrl gets an object of type Magento\Downloadable\Model\Sample which actually should be considered as Magento\Downloadable\Api\Data\SampleInterface. Also getSamples doesn't return an array, it returns a Collection.
Fixed Issues
This pull request is not fixing a bug, it just to improve type hints in IDE.