ln: add relative example (#19773)

Author: Managor

pages/common/ln.md

@@ -7,6 +7,10 @@
 
 `ln {{[-s|--symbolic]}} /{{path/to/file_or_directory}} {{path/to/symlink}}`
 
+- Create a symbolic link relative to where the link is located:
+
+`ln {{[-s|--symbolic]}} {{path/to/file_or_directory}} {{path/to/symlink}}`
+
 - Overwrite an existing symbolic link to point to a different file:
 
 `ln {{[-sf|--symbolic --force]}} /{{path/to/new_file}} {{path/to/symlink}}`