Refactor: add missing or_directory where needed.

This commit adds the missing `_or_directory` to any example which is
specifying an action affecting a file or a directory, but uses the
token `{{path/to/file}}` instead of `{{path/to/file_or_directory}}`.

pages/common/ln.md

@@ -2,9 +2,9 @@
 
 > Creates links to files and folders.
 
-- Create a symbolic link to a file (or folder):
+- Create a symbolic link to a file or directory:
 
-`ln -s {{path/to/file}} {{path/to/symlink}}`
+`ln -s {{path/to/file_or_directory}} {{path/to/symlink}}`
 
 - Overwrite an existing symbolic to point to a different file: