docs: Fix status of OEP-63

[antoviaque]

OEP-63 was accepted and merged in #484 but the status of the OEP hasn't been updated.

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[antoviaque]

Hi @sarina , the bot suggested you might do the review - I have just noticed we hadn't updated the status of OEP-63 after merging it, when I looked it up today.

[sarina]

Generally I'd recommend tagging authors and/or arbiters to make sure everyone agrees on the status change, but I'm happy to approve this.

cc @e0d as arbiter.

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