Add attribute necessary for embedding opengraph images in docs-ui automatically #4639
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This PR is a prerequisite necessary for docs-ui to automatically add the correct opengraph images to each documentation, see issue owncloud/docs-ui#396
Note that this PR and the backports must be merged before the docs-ui PR gets merged.
Note that the separator of the items in teh attribute can be a blank or a comma with a blank.
For better readability, comma with blank has been chosen.
Backport to 10.9 and 10.8