Formatting changes to make 1.12.x ref docs buildable in Jekyll

Signed-off-by: Misty Stanley-Jones <misty@docker.com>

docs/reference/commandline/node_ls.md

@@ -1,17 +1,14 @@
-<!--[metadata]>
-+++
-title = "node ls"
-description = "The node ls command description and usage"
-keywords = ["node, list"]
-[menu.main]
-parent = "smn_cli"
-+++
-<![end-metadata]-->
+---
+redirect_from:
+  - /reference/commandline/node_ls/
+description: The node ls command description and usage
+keywords:
+- node, list
+title: docker node ls
+---
 
 **Warning:** this command is part of the Swarm management feature introduced in Docker 1.12, and might be subject to non backward-compatible changes.
 
-# node ls
-
 ```markdown
 Usage:  docker node ls [OPTIONS]
 
@@ -26,7 +23,7 @@ Options:
   -q, --quiet          Only display IDs
 ```
 
-Lists all the nodes that the Docker Swarm manager knows about. You can filter using the `-f` or `--filter` flag. Refer to the [filtering](#filtering) section for more information about available filter options.
+Lists all the nodes that the Docker Swarm manager knows about. You can filter using the `-f` or `--filter` flag. Refer to the [filtering](node_ls.md#filtering) section for more information about available filter options.
 
 Example output: