Quarto v1.3中如何移除提示框内huxtable上方的灰色水平线？

直接在Huxtable的链式操作中添加set_top_border，将表格顶部边框宽度设为0即可移除灰色水平线，同时保留列宽设置。修改后的完整代码如下：

---
title: Table style
format: html
---

::: {.callout-important}

Some text about the table

```{r}
#| echo: false
#| warning: false
#| output: asis

library(huxtable)

t1 <-  matrix(c("",            "",   "Success", "",     "", 
                "",            "",   "no",      "yes",  "", 
                "Medication",  "A",  4,         2,      6,
                "",            "B",  2,         5,      7,
                "",            "",   6,         7,      13),
              nrow = 5, byrow = T)

huxtable::as_hux(t1) |> 
  set_top_border(row = 1, col = everywhere, value = 0) |> # 移除顶部边框
  set_bottom_border(row = c(2,4), col = 2:5) |>
  set_bottom_border(row = c(1,5), col = c(3,4)) |>
  
  set_right_border(row = 2:5, col = c(2,4)) |> 
  set_right_border(row = c(3,4), col = c(1,5)) |> 
  
  set_bold(row = 1, col = 3) |> 
  set_bold(row = 3, col = 1) |> 
  
  set_col_width(col = everywhere, 0.2)

:::

### 原因说明
这条灰色水平线是Huxtable默认的表格顶部边框样式，当在Quarto的callout块中使用`output: asis`输出表格时，默认边框样式会被渲染出来。通过`set_top_border(row = 1, col = everywhere, value = 0)`可以精准关闭表格第一行所有列的顶部边框，既解决了水平线问题，又不会影响其他自定义边框和列宽设置。

内容的提问来源于stack exchange，提问作者DStuder