remove Jekyll tags from CLI reference

These Markdown files are now embedded in a YAML
file for templating in the documentation, and
these special markers are no longer needed.

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

docs/reference/commandline/plugin_ls.md

@@ -101,11 +101,9 @@ The following example uses a template without headers and outputs the
 `ID` and `Name` entries separated by a colon for all plugins:
 
 ```bash
-{% raw %}
 $ docker plugin ls --format "{{.ID}}: {{.Name}}"
 
 4be01827a72e: tiborvass/no-remove
-{% endraw %}
 ```