mkdir: add command to insert multiple directories with example (#6326)

pages/common/mkdir.md

@@ -7,6 +7,10 @@
 
 `mkdir {{directory}}`
 
+- Create multiple directories in the current directory:
+
+`mkdir {{directory_1 directory_2 ...}}`
+
 - Create directories recursively (useful for creating nested dirs):
 
 `mkdir -p {{path/to/directory}}`