dhi: clarify login (#23859)

<!--Delete sections as needed -->

## Description

Clarify that you must log in using your Docker credentials (not some
special dhi credentials) with a link to create if necessary, noting that
it's free.

## Related issues or tickets

https://docker.slack.com/archives/C04BMTUC41E/p1765993571833459

## Reviews

<!-- Notes for reviewers here -->
<!-- List applicable reviews (optionally @tag reviewers) -->

- [ ] Editorial review

---------

Signed-off-by: Craig Osterhout <craig.osterhout@docker.com>
Co-authored-by: Allie Sadler <102604716+aevesdocker@users.noreply.github.com>

Author: craig-osterhout

content/manuals/dhi/get-started.md

@@ -47,14 +47,20 @@ DHIs](./how-to/use.md#considerations-when-adopting-dhis).
 The following example demonstrates that you can run the Python image and execute
 a simple Python command just like you would with any other Docker image:
 
-1. Open a terminal and run the following commands:
+1. Open a terminal and sign in to the Docker Hardened Images registry using your
+   Docker ID credentials.
 
    ```console
    $ docker login dhi.io
+   ```
+
+2. Pull the image:
+
+   ```console
    $ docker pull dhi.io/python:3.13
    ```
 
-2. Run the image to confirm everything works:
+3. Run the image to confirm everything works:
 
     ```console
     $ docker run --rm dhi.io/python:3.13 python -c "print('Hello from DHI')"

content/manuals/dhi/how-to/scan.md

@@ -25,12 +25,12 @@ be mirrored into your organization on Docker Hub.
 
 > [!IMPORTANT]
 >
-> You must authenticate to the Docker Hardened Image registry (`dhi.io`) to pull images. To
-> do this, you can use [`docker login`](../../../reference/cli/docker/login.md):
+> You must authenticate to the Docker Hardened Images registry (`dhi.io`) to
+> pull images. Use your Docker ID credentials (the same username and password
+> you use for Docker Hub) when signing in. If you don't have a Docker account,
+> [create one](../../accounts/create-account.md) for free.
 >
-> ```console
-> $ docker login dhi.io
-> ```
+> Run `docker login dhi.io` to authenticate.
 
 ## Docker Scout
 

content/manuals/dhi/how-to/use.md

@@ -16,12 +16,12 @@ package manager, and may run as a nonroot user by default.
 
 > [!IMPORTANT]
 >
-> You must authenticate to the Docker Hardened Image registry (`dhi.io`) to pull images. To
-> do this, you can use [`docker login`](../../../reference/cli/docker/login.md):
+> You must authenticate to the Docker Hardened Images registry (`dhi.io`) to
+> pull images. Use your Docker ID credentials (the same username and password
+> you use for Docker Hub) when signing in. If you don't have a Docker account,
+> [create one](../../accounts/create-account.md) for free.
 >
-> ```console
-> $ docker login dhi.io
-> ```
+> Run `docker login dhi.io` to authenticate.
 
 ## Considerations when adopting DHIs
 

content/manuals/dhi/how-to/verify.md

@@ -18,13 +18,12 @@ Docker's public key for DHI images and charts is published at:
 
 > [!IMPORTANT]
 >
-> You must authenticate to the Docker Hardened Image registry (`dhi.io`) to pull images. To
-> do this, you can use [`docker login`](../../../reference/cli/docker/login.md):
+> You must authenticate to the Docker Hardened Images registry (`dhi.io`) to
+> pull images. Use your Docker ID credentials (the same username and password
+> you use for Docker Hub) when signing in. If you don't have a Docker account,
+> [create one](../../accounts/create-account.md) for free.
 >
-> ```console
-> $ docker login dhi.io
-> ```
-
+> Run `docker login dhi.io` to authenticate.
 
 ## Verify image attestations with Docker Scout
 

content/manuals/dhi/migration/examples/go.md

@@ -21,6 +21,10 @@ Hardened Images. Each example includes four variations:
 > supported for simplicity, but come with tradeoffs in size and security.
 >
 > You must authenticate to `dhi.io` before you can pull Docker Hardened Images.
+> Use your Docker ID credentials (the same username and password you use for
+> Docker Hub). If you don't have a Docker account, [create
+> one](../../../accounts/create-account.md) for free.
+>
 > Run `docker login dhi.io` to authenticate.
 
 {{< tabs >}}

content/manuals/dhi/migration/examples/node.md

@@ -21,6 +21,10 @@ Hardened Images. Each example includes four variations:
 > supported for simplicity, but come with tradeoffs in size and security.
 >
 > You must authenticate to `dhi.io` before you can pull Docker Hardened Images.
+> Use your Docker ID credentials (the same username and password you use for
+> Docker Hub). If you don't have a Docker account, [create
+> one](../../../accounts/create-account.md) for free.
+>
 > Run `docker login dhi.io` to authenticate.
 
 {{< tabs >}}

content/manuals/dhi/migration/migrate-from-doi.md

@@ -46,6 +46,10 @@ replaced by the new hardened image.
 > [!NOTE]
 >
 > You must authenticate to `dhi.io` before you can pull Docker Hardened Images.
+> Use your Docker ID credentials (the same username and password you use for
+> Docker Hub). If you don't have a Docker account, [create
+> one](../../accounts/create-account.md) for free.
+>
 > Run `docker login dhi.io` to authenticate.
 
 

content/manuals/dhi/migration/migrate-from-wolfi.md

@@ -32,6 +32,10 @@ replaced by the new hardened image.
 > [!NOTE]
 >
 > You must authenticate to `dhi.io` before you can pull Docker Hardened Images.
+> Use your Docker ID credentials (the same username and password you use for
+> Docker Hub). If you don't have a Docker account, [create
+> one](../../accounts/create-account.md) for free.
+>
 > Run `docker login dhi.io` to authenticate.
 
 ```diff