add documentation for docker stack ps

also updates related stack docs and removes stack_tasks.md

Signed-off-by: Alicia Lauerman <allydevour@me.com>
(cherry picked from commit 970ab9a224)
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

docs/reference/commandline/stack_config.md

@@ -25,4 +25,5 @@ Displays the configuration of a stack.
 * [stack deploy](stack_deploy.md)
 * [stack rm](stack_rm.md)
 * [stack services](stack_services.md)
-* [stack tasks](stack_tasks.md)
+* [stack ps](stack_ps.md)
+* [stack ls](stack_ls.md)

docs/reference/commandline/stack_deploy.md

@@ -54,4 +54,5 @@ axqh55ipl40h  vossibility-stack_vossibility-collector  1 icecrime/vossibility-co
 * [stack config](stack_config.md)
 * [stack rm](stack_rm.md)
 * [stack services](stack_services.md)
-* [stack tasks](stack_tasks.md)
+* [stack ps](stack_ps.md)
+* [stack ls](stack_ls.md)

docs/reference/commandline/stack_ps.md

@@ -2,22 +2,22 @@
 redirect_from:
   - /reference/commandline/stack_tasks/
 advisory: experimental
-description: The stack tasks command description and usage
+description: The stack ps command description and usage
 keywords:
-- stack, tasks
-title: docker stack tasks (experimental)
+- stack, ps
+title: docker stack ps (experimental)
 ---
 
 ```markdown
-Usage:  docker stack tasks [OPTIONS] STACK
+Usage:  docker stack ps [OPTIONS] STACK
 
 List the tasks in the stack
 
 Options:
   -a, --all            Display all tasks
   -f, --filter value   Filter output based on conditions provided
-      --help           Print usage
       --no-resolve     Do not map IDs to Names
+      --no-trunc       Do not truncate output
 ```
 
 Lists the tasks that are running as part of the specified stack. This
@@ -32,9 +32,9 @@ Multiple filter flags are combined as an `OR` filter. For example,
 
 The currently supported filters are:
 
-* [id](stack_tasks.md#id)
-* [name](stack_tasks.md#name)
-* [desired-state](stack_tasks.md#desired-state)
+* [id](stack_ps.md#id)
+* [name](stack_ps.md#name)
+* [desired-state](stack_ps.md#desired-state)
 
 ## Related information
 

docs/reference/commandline/stack_rm.md

@@ -28,4 +28,5 @@ a manager node.
 * [stack config](stack_config.md)
 * [stack deploy](stack_deploy.md)
 * [stack services](stack_services.md)
-* [stack tasks](stack_tasks.md)
+* [stack ps](stack_ps.md)
+* [stack ls](stack_ls.md)

docs/reference/commandline/stack_services.md

@@ -59,4 +59,5 @@ The currently supported filters are:
 * [stack config](stack_config.md)
 * [stack deploy](stack_deploy.md)
 * [stack rm](stack_rm.md)
-* [stack tasks](stack_tasks.md)
+* [stack ps](stack_ps.md)
+* [stack ls](stack_ls.md)