Og:image hierarchy in functional specification

[shabnam611]

Please give us a description of the issue

We do not have search appearance and social settings in Yoast SEO anymore, instead we have social appearance default tab from Settings > Content type. So we should modify the following two points from the og:image hierarchy list.

The "Social default image" from the template in Search Appearance.
The site's fallback/default social image (set at SEO > Social > Facebook > Default image).

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