Added in an additional use of mkdir. (#24939)

Added in the ability to create multiple directories at a given level via usage of curly brackets {}

guide/english/bash/bash-mkdir/index.md

@@ -16,7 +16,19 @@ Commonly used options:
 - `-p` no error if existing, make parent directories as needed.
 - `-v` prints message for each created directory.
 
-Let's say we need to create a directory `dir` in the path `a/b/c/dir`, but directory `b` and `c` don't exist. In this case, `mkdir -p a/b/c/dir` will create the missing directories in the path.
+Let's say we need to create a directory `dir` in the path `a/b/c/dir`, but directory `b` and `c` don't exist. In this case, `mkdir -p a/b/c/dir` will create the missing directories in the path.  
+
+You can also create multiple directories at a given level.  Picture the following directory structure:
+```
+.
+└── wwwroot
+    ├── css
+    ├── images
+    └── media
+        ├── mp3
+        └── mp4
+```
+This can easily be recreated `mkdir -p wwwroot/{css,images,media/{mp4,mp3}}` By using curly braces `{}` you can create multiple directories at a given level.
 
 ### More Information:
 * [Wikipedia - Mkdir](https://en.wikipedia.org/wiki/Mkdir)