Allow OG "See also" to have multiple values

I did a quick search on the tag and found https://stackoverflow.com/questions/27913739/how-are-open-graph-ogsee-al... and https://stackoverflow.com/questions/24157235/open-graph-ogsee-also-param..., both of which mention it should allow multiple values. However, I can't find any official documentation on it on either the OG site, Facebook's docs site, or Pinterest's site, so it may be deprecated. That said, let's make it allow multiple values because it seems like it was supposed to.

No doubt you can add up to 4 URLs; if needed, I currently add them via a twig file.

I did not see you renamed the issue, Damien. This is very kind of you, thank you very much.

Greetings,

Allowing multiple comma separated values to the og:see_also tag would be a nice feature for the upcoming metatag 2.x release.

Thank you once again for this module.

This only needed a tiny change.

@gillesbailleux would you mind testing this and provide some feedback to push things forward here?

The tests are green, so maybe this can be set RTBC if it works? The change is quite simple.

@Anybody: the patch has been successfully applied on two websites through two manners. It has been programmatically applied on a live site thanks to the help of Didier Misson → and manually applied by me on a test website.

Two comma separated values have been added to the "See also" field and the two values are in the source code.

Thank you very much and greetings from Belgium.

Thank you very much for the quick reply @gillesbailleux so let's set this RTBC :)