[+DOC] ILM Move Step example only phase

Updates [doc](https://www.elastic.co/guide/en/elasticsearch/reference/master/ilm-move-to-step.html?edit) to append example similar to #75435 (≥v7.15.0) to show users working example of only using `next_step.phase`.

Author: stefnestor

docs/reference/ilm/apis/move-to-step.asciidoc

@@ -95,12 +95,12 @@ For more information, see <<index-lifecycle-error-handling, {ilm-init} error han
 The name of the phase that contains the action you want to perform or resume.
 
 `action`::
-(Required, string)
-The name action you want to perform or resume. 
+(Optional, string)
+The name action you want to perform or resume. Required if `name` used.
 
 `name`::
-(Required, string)
-The name of the step to move to and execute. 
+(Optional, string)
+The name of the step to move to and execute. Required if `action` used.
 
 ====
 
@@ -168,6 +168,24 @@ POST _ilm/move/my-index-000001
 <3> The optional action to which the index will be moved
 <4> The optional step name to which the index will be moved
 
+Alternatively, the following example pushes `my-index-000001` 
+from the end of hot phase into the start of warm:
+
+[source,console]
+--------------------------------------------------
+POST _ilm/move/my-index-000001
+{
+  "current_step": {
+    "phase": "hot",
+    "action": "complete",
+    "name": "complete"
+  },
+  "next_step": {
+    "phase": "warm"
+  }
+}
+--------------------------------------------------
+
 If the request succeeds, you receive the following result:
 
 [source,console-result]