📝 Update changelogs

Signed-off-by: Daniel <845765@qq.com>

app/changelogs/v3.5.6/v3.5.5.md

@@ -14,6 +14,7 @@ Below are the detailed changes in this version.
 * [Improve editing toolbar on mobile browsers](https://github.com/siyuan-note/siyuan/issues/17006)
 * [Improve cursor position after Esc closes the formula edit box](https://github.com/siyuan-note/siyuan/issues/17024)
 * [Export preview mode supports rendering merged cell tables](https://github.com/siyuan-note/siyuan/issues/17029)
+* [Merged cell tables using HTML tags when exporting to Markdown](https://github.com/siyuan-note/siyuan/issues/17030)
 
 ### Bugfix
 

app/changelogs/v3.5.6/v3.5.5_zh_CHT.md

@@ -14,6 +14,7 @@
 * [改進行動瀏覽器上的編輯工具列](https://github.com/siyuan-note/siyuan/issues/17006)
 * [改進 Esc 關閉公式編輯框後的遊標位置](https://github.com/siyuan-note/siyuan/issues/17024)
 * [匯出預覽模式支援渲染合併儲存格表格](https://github.com/siyuan-note/siyuan/issues/17029)
+* [合併儲存格表格在匯出 Markdown 時使用 HTML 標籤](https://github.com/siyuan-note/siyuan/issues/17030)
 
 ### 修復缺陷
 

app/changelogs/v3.5.6/v3.5.5_zh_CN.md

@@ -14,6 +14,7 @@
 * [改进移动浏览器上的编辑工具栏](https://github.com/siyuan-note/siyuan/issues/17006)
 * [改进 Esc 关闭公式编辑框后的光标位置](https://github.com/siyuan-note/siyuan/issues/17024)
 * [导出预览模式支持渲染合并单元格表格](https://github.com/siyuan-note/siyuan/issues/17029)
+* [合并单元格表格在导出 Markdown 时使用 HTML 标签](https://github.com/siyuan-note/siyuan/issues/17030)
 
 ### 修复缺陷