Remove "secrets" leftovers from docs

f5e1f6f6880391a5a3399023cf93a3c48502e57d replaced "secrets"
with "join tokens", which also removed the "auto-accept"
policy.

This removes some remaining references to those features.

Note that there are other references, but those
are already addressed in another pull request.

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
Upstream-commit: 2a87a358d4
Component: cli

components/cli/docs/reference/commandline/node_ls.md

@@ -29,12 +29,14 @@ Lists all the nodes that the Docker Swarm manager knows about. You can filter us
 
 Example output:
 
-    $ docker node ls
-    ID                           HOSTNAME        STATUS  AVAILABILITY  MANAGER STATUS
-    1bcef6utixb0l0ca7gxuivsj0    swarm-worker2   Ready   Active
-    38ciaotwjuritcdtn9npbnkuz    swarm-worker1   Ready   Active
-    e216jshn25ckzbvmwlnh5jr3g *  swarm-manager1  Ready   Active        Leader
+```bash
+$ docker node ls
 
+ID                           HOSTNAME        STATUS  AVAILABILITY  MANAGER STATUS
+1bcef6utixb0l0ca7gxuivsj0    swarm-worker2   Ready   Active
+38ciaotwjuritcdtn9npbnkuz    swarm-worker1   Ready   Active
+e216jshn25ckzbvmwlnh5jr3g *  swarm-manager1  Ready   Active        Leader
+```
 
 ## Filtering
 
@@ -53,18 +55,23 @@ The `name` filter matches on all or part of a node name.
 
 The following filter matches the node with a name equal to `swarm-master` string.
 
-    $ docker node ls -f name=swarm-manager1
-    ID                           HOSTNAME        STATUS  AVAILABILITY  MANAGER STATUS
-    e216jshn25ckzbvmwlnh5jr3g *  swarm-manager1  Ready   Active        Leader
+```bash
+$ docker node ls -f name=swarm-manager1
+
+ID                           HOSTNAME        STATUS  AVAILABILITY  MANAGER STATUS
+e216jshn25ckzbvmwlnh5jr3g *  swarm-manager1  Ready   Active        Leader
+```
 
 ### id
 
 The `id` filter matches all or part of a node's id.
 
-    $ docker node ls -f id=1
-    ID                         HOSTNAME       STATUS  AVAILABILITY  MANAGER STATUS
-    1bcef6utixb0l0ca7gxuivsj0  swarm-worker2  Ready   Active
+```bash
+$ docker node ls -f id=1
 
+ID                         HOSTNAME       STATUS  AVAILABILITY  MANAGER STATUS
+1bcef6utixb0l0ca7gxuivsj0  swarm-worker2  Ready   Active
+```
 
 #### label
 
@@ -75,6 +82,7 @@ The following filter matches nodes with the `usage` label regardless of its valu
 
 ```bash
 $ docker node ls -f "label=foo"
+
 ID                         HOSTNAME       STATUS  AVAILABILITY  MANAGER STATUS
 1bcef6utixb0l0ca7gxuivsj0  swarm-worker2  Ready   Active
 ```