datasource: change phrasing for iteration_id

The comment was mentioning the name of an iteration Id, which is
conflicting.
This commit rephrases the comment to directly specify the ID of the
iteration.

datasource/hcp-packer-image/data.go

@@ -39,7 +39,7 @@ type Config struct {
 	// `hcp_packer_image`s use a shared `hcp_packer_iteration` that will
 	// only generate one potentially billable request.
 	Channel string `mapstructure:"channel" required:"true"`
-	// The name of the iteration Id to use when retrieving your image
+	// The ID of the iteration to use when retrieving your image
 	// Either this or `channel` MUST be set.
 	// Mutually exclusive with `channel`
 	IterationID string `mapstructure:"iteration_id" required:"true"`

website/content/partials/datasource/hcp-packer-image/Config-required.mdx

@@ -12,7 +12,7 @@
   `hcp_packer_image`s use a shared `hcp_packer_iteration` that will
   only generate one potentially billable request.
 
-- `iteration_id` (string) - The name of the iteration Id to use when retrieving your image
+- `iteration_id` (string) - The ID of the iteration to use when retrieving your image
   Either this or `channel` MUST be set.
   Mutually exclusive with `channel`