Correct information about root action metadata file (#36483)

Co-authored-by: Alex Nguyen <[email protected]>

Author: jsoref

content/actions/sharing-automations/creating-actions/publishing-actions-in-github-marketplace.md

@@ -24,9 +24,9 @@ When you plan to publish your action to {% data variables.product.prodname_marke
 Actions are published to {% data variables.product.prodname_marketplace %} immediately and aren't reviewed by {% data variables.product.prodname_dotcom %} as long as they meet these requirements:
 
 * The action must be in a public repository.
-* Each repository must contain a single action.
+* Each repository must contain a single action metadata file (`action.yml` or `action.yaml`) at the root.
+  * Repositories may include other actions metadata files in sub-folders, but they will not be automatically listed in the marketplace.
 * Each repository must _not_ contain any workflow files.
-* The action's metadata file (`action.yml`) must be in the root directory of the repository.
 * The `name` in the action's metadata file must be unique.
   * The `name` cannot match an existing action name published on {% data variables.product.prodname_marketplace %}.
   * The `name` cannot match a user or organization on {% data variables.product.prodname_dotcom %}, unless the user or organization owner is publishing the action. For example, only the {% data variables.product.prodname_dotcom %} organization can publish an action named `github`.