tokenSliceForRender

fn tokenSliceForRender(tree: Ast, token_index: Ast.TokenIndex) []const u8 {
    var ret = tree.tokenSlice(token_index);
    switch (tree.tokenTag(token_index)) {
        .container_doc_comment, .doc_comment => {
            ret = mem.trimEnd(u8, ret, &std.ascii.whitespace);
        },
        else => {},
    }
    return ret;
}