docs/options/ipc: fix list syntax
@@ -13,4 +13,4 @@ a private IPC namespace.
- **none**: private IPC namespace, with /dev/shm not mounted.
- **ns:**_path_: path to an IPC namespace to join.
- **private**: private IPC namespace.
-= **shareable**: private IPC namespace with a possibility to share it with other containers.
+- **shareable**: private IPC namespace with a possibility to share it with other containers.
