chore: call attention to hooking into a private registry (#450)

Katie Horne · web-flow · commit 59def659041a · 2021-06-29T10:50:55.000-05:00
diff --git a/admin/registries/index.md b/admin/registries/index.md
@@ -20,11 +20,10 @@ To import an image:
 1. In the dialog that opens, you'll be prompted to pick a registry by default.
    However, to _add_ a registry, click **Add a new registry**, which is the
    option located immediately below the registry selector.
-1. You'll be asked to provide a **registry name**, the **registry**, and a
-   **username** and **password** combination (if needed for access to the
-   registry).
-1. Then, continue with the process of [adding your
-   image](../../images/index.md).
+1. You'll be asked to provide a **registry name** and the **registry**.
+1. **Optional.** If your registry is a **private registry**, provide the
+   **username** and **password** combination required to access the registry.
+1. Continue with the process of [adding your image](../../images/index.md).
 1. When done, click **Import**.
 
 ## Deleting a registry
