docs: add Premium license warning for external_agent resource (#434)

* docs: add Premium license warning for external_agent resource

Co-authored-by: M Atif Ali <[email protected]>

* fix: add Premium license warning to external_agent resource description

The warning needs to be in the Go code description field so it gets
auto-generated into the documentation.

Co-authored-by: M Atif Ali <[email protected]>

* docs: remove manual markdown edit to let auto-generation handle warning

The warning is now properly added in the Go code description field
and will be auto-generated into the documentation.

Co-authored-by: M Atif Ali <[email protected]>

* docs: add Premium license warning with pricing link to external_agent

Updated the Go code description to include a warning about Premium
license requirement with a link to pricing, then ran make gen to
regenerate the documentation.

Co-authored-by: M Atif Ali <[email protected]>

---------

Co-authored-by: blink-so[bot] <211532188+blink-so[bot]@users.noreply.github.com>
Co-authored-by: M Atif Ali <[email protected]>

Author: blink-so[bot]

docs/resources/external_agent.md

@@ -4,12 +4,15 @@ page_title: "coder_external_agent Resource - terraform-provider-coder"
 subcategory: ""
 description: |-
   Define an external agent to be used in a workspace.
+  ~> Warning: External agents require a Premium https://coder.com/pricing Coder license.
 ---
 
 # coder_external_agent (Resource)
 
 Define an external agent to be used in a workspace.
 
+~> **Warning:** External agents require a [Premium](https://coder.com/pricing) Coder license.
+
 
 
 <!-- schema generated by tfplugindocs -->

provider/external_agent.go

@@ -12,7 +12,7 @@ func externalAgentResource() *schema.Resource {
 	return &schema.Resource{
 		SchemaVersion: 1,
 
-		Description: "Define an external agent to be used in a workspace.",
+		Description: "Define an external agent to be used in a workspace.\n\n~> **Warning:** External agents require a [Premium](https://coder.com/pricing) Coder license.",
 		CreateContext: func(ctx context.Context, rd *schema.ResourceData, _ interface{}) diag.Diagnostics {
 			rd.SetId(uuid.NewString())
 			return nil