[Backport] Fixes in catalog component blocks [2.1-develop] #15915
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Original Pull Request
#15558
Description
This PR fixes a few PHPDocs and annotations typos along with wrong return type suggestions.
It also solves an issue with the method
Magento\Backend\Block\Widget\Grid\Extended::addColumn()
invoking with 3 parameters when only 2 are required. See line 105Contribution checklist