docs(coder_ai_task): add min coder version for prompt and enabled (#459)

* docs(coder_ai_task): add min coder version for `prompt` and `enabled`

* indent callouts

---------

Co-authored-by: Cian Johnston <cian@coder.com>

Author: DanielleMaywood

docs/resources/ai_task.md

@@ -22,10 +22,14 @@ Use this resource to define Coder tasks.
 
 ### Read-Only
 
-- `enabled` (Boolean) True when executing in a Coder Task context, false when in a Coder Workspace context
+- `enabled` (Boolean) True when executing in a Coder Task context, false when in a Coder Workspace context.
+
+  -> The `enabled` field is only populated in Coder v2.28 and later.
 - `id` (String) A unique identifier for this resource.
 - `prompt` (String) The prompt text provided to the task by Coder.
 
+  -> The `prompt` field is only populated in Coder v2.28 and later.
+
 <a id="nestedblock--sidebar_app"></a>
 ### Nested Schema for `sidebar_app`
 

provider/ai_task.go

@@ -95,7 +95,7 @@ func aiTaskResource() *schema.Resource {
 			},
 			"prompt": {
 				Type:        schema.TypeString,
-				Description: "The prompt text provided to the task by Coder.",
+				Description: "The prompt text provided to the task by Coder.\n\n  -> The `prompt` field is only populated in Coder v2.28 and later.",
 				Computed:    true,
 			},
 			"app_id": {
@@ -109,7 +109,7 @@ func aiTaskResource() *schema.Resource {
 			},
 			"enabled": {
 				Type:        schema.TypeBool,
-				Description: "True when executing in a Coder Task context, false when in a Coder Workspace context",
+				Description: "True when executing in a Coder Task context, false when in a Coder Workspace context.\n\n  -> The `enabled` field is only populated in Coder v2.28 and later.",
 				Computed:    true,
 			},
 		},