Add multi range brace expansion to bash.md (#2071)

Author: Iftakharpy

bash.md

@@ -118,11 +118,12 @@ See: [Unofficial bash strict mode](http://redsymbol.net/articles/unofficial-bash
 echo {A,B}.js
 ```
 
-| Expression | Description         |
-| ---------- | ------------------- |
-| `{A,B}`    | Same as `A B`       |
-| `{A,B}.js` | Same as `A.js B.js` |
-| `{1..5}`   | Same as `1 2 3 4 5` |
+| Expression          | Description           |
+| ------------------- | --------------------- |
+| `{A,B}`             | Same as `A B`         |
+| `{A,B}.js`          | Same as `A.js B.js`   |
+| `{1..5}`            | Same as `1 2 3 4 5`   |
+| `{{1..3},{7..9}}`   | Same as `1 2 3 7 8 9` |
 
 See: [Brace expansion](https://web.archive.org/web/20230207192110/https://wiki.bash-hackers.org/syntax/expansion/brace)