When you set the content description for RecyclerView, it will be announced by Talkback. Instead of a generic "In list" announcement, the user will hear "In list ". This can be used as a short description to better explain the purpose of the list, like a name for the list. It will also be used to announce when the user navigates away from the list.
This is not the expected place to put in a longer explanation, as it is used both to enter and leave the list. If you need to add additional information, a better approach would be to have some sort of label before the RecyclerView, so it's available for all users, not just via Talkback.
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