Square brackets, [[ and ]], are an example of a technical device that aids inter-connectivity. They work as metadata hints that can serve to bootstrap a [[distributed knowledge graph]]. In general if they bother you feel free to ignore them; apologies.
Users of an Agora use social media to communicate optimally. This means trying to be maximally clear, follow the principle of charity, observe constructive social protocols, and in general follow any all conventions explicitly stated to aim to improve our mutual understanding.