Revert "Change the syntax to not depend on jinja2."

This reverts commit 9de737bf29.

Signed-off-by: Paul Holzinger <pholzing@redhat.com>

docs/source/markdown/options/cap-add.md

@@ -2,11 +2,11 @@
 ####>   podman podman-container.unit.5.md.in, create, run
 ####> If file is edited, make sure the changes
 ####> are applicable to all of those.
-<< if is_quadlet >>
+{% if is_quadlet %}
 ### `AddCapability=capability`
-<< else >>
+{% else %}
 #### **--cap-add**=*capability*
-<< endif >>
+{% endif %}
 
 Add Linux capabilities.