Clarified .github/workflows name importance in quickstart.md (git…

…hub#31837)

Co-authored-by: Sarah Edwards <[email protected]>

content/actions/quickstart.md

@@ -24,8 +24,8 @@ The following example shows you how {% data variables.product.prodname_actions %
 
 ## Creating your first workflow
 
-1. Create a `.github/workflows` directory in  your repository on {% data variables.product.prodname_dotcom %} if this directory does not already exist.
-1. In the `.github/workflows` directory, create a file named `github-actions-demo.yml`. For more information, see "[AUTOTITLE](/repositories/working-with-files/managing-files/creating-new-files)."
+1. Create a `.github/workflows` directory in  your repository on {% data variables.product.prodname_dotcom %} if this directory does not already exist. The directory must have this exact name in order for {% data variables.product.prodname_dotcom %} to discover any {% data variables.product.prodname_actions %} workflows that it contains.
+1. In the `.github/workflows` directory, create a file with the `.yml` or `.yaml` extension. This tutorial will use `github-actions-demo.yml` as the file name. For more information, see "[AUTOTITLE](/repositories/working-with-files/managing-files/creating-new-files)."
 1. Copy the following YAML contents into the `github-actions-demo.yml` file:
 
    ```yaml copy