docker_swarm_service: Documentation fixes (#53479)

* Document and validate mode choices

* Update examples

* Test cpu float values

* Test correct option

* Fix module return sample

* Add secrets and user to module return value

* Order options alphabetically

* Add changelog

* yaml indentation

* Revert "Order options alphabetically"

This reverts commit 51dabccda7930b707d5683670af7f89a68aeb577.

* Be consistent with choices type

test/integration/targets/docker_swarm_service/tasks/tests/options.yml

@@ -1106,7 +1106,7 @@
     image: alpine:3.8
     resolve_image: no
     command: '/bin/sh -v -c "sleep 10m"'
-    labels: {}
+    healthcheck: {}
   register: healthcheck_8
   ignore_errors: yes
 
@@ -1116,7 +1116,7 @@
     image: alpine:3.8
     resolve_image: no
     command: '/bin/sh -v -c "sleep 10m"'
-    labels: {}
+    healthcheck: {}
   register: healthcheck_9
   ignore_errors: yes
 

test/integration/targets/docker_swarm_service/tasks/tests/resources.yml

@@ -48,7 +48,7 @@
     resolve_image: no
     command: '/bin/sh -v -c "sleep 10m"'
     limits:
-      cpus: 2
+      cpus: 0.5
   register: limit_cpu_3
 
 - name: cleanup
@@ -159,7 +159,7 @@
     resolve_image: no
     command: '/bin/sh -v -c "sleep 10m"'
     reservations:
-      cpus: 2
+      cpus: 0.5
   register: reserve_cpu_3
 
 - name: cleanup

test/integration/targets/docker_swarm_service/vars/main.yml

@@ -26,6 +26,7 @@ service_expected_output:
   mode: global
   mounts: null
   networks: null
+  secrets: null
   stop_grace_period: null
   stop_signal: null
   placement_preferences: null
@@ -46,4 +47,5 @@ service_expected_output:
   update_monitor: null
   update_order: null
   update_parallelism: null
+  user: null
   working_dir: null