Auto generate a blob of text for the corresponding finish function
Currently, the async function docs include a blob of text mentioning to the end-users that they should call the _finish function to get the result of the async call. As we have nowadays an annotation for it, it would be nice if a blob of text is automatically included in the generated docs by gi-docgen so that the libraries would stop including it themselves.
This would make the bindings docs more user-friendly as they usually automatically call the corresponding _finish function for you.