docs(reference): cover bare dice and tilde fences

Add the bare d-form (d20) to the dice notation table, and note that role fences accept backticks or tildes with hyphen-capable attribute keys. Regenerate both reference copies from known.ts and mirror the notes in the skill and markdown docs.

docs/markdown.md

@@ -11,6 +11,10 @@
 - [marked-gfm-heading-id](https://github.com/markedjs/marked-gfm-heading-id) - 标题 ID
 - [marked-directive](https://github.com/fengzilong/marked-directive) - 指令语法
 
+### 代码块围栏
+
+代码块围栏可使用反引号或波浪号（`~~~`）书写；闭合围栏必须与开启围栏使用相同字符，且不短于开启围栏。声明 `role=` 的代码块同理。
+
 ## 指令语法
 
 通过 `marked-directive` 支持自定义组件插入：
@@ -123,6 +127,7 @@
 - 点击文本执行掷骰
 - 点击骰子图标重置为公式
 - `key` 属性将结果记录到 URL 参数中 (`?dice-attack=15`)
+- 骰子数量可省略，`d20` 等价于 `1d20`
 
 **属性：**