dhi: update customizations (#24503)

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## Description

Follow up to #24500. I incorrectly interpreted and tested only the
distros and not the distro versions.

The UI wording is dynamic based on distro *and* version. I removed the
UI wording instead of updating as it makes the simple step more complex
than necessary by having to explain an insignificant UI quirk. Added the
explanation to the paragraph below the main step text.

Debian UI wording is **Packages**
Alpine 3.22 UI wording is **Packages**
Alpine 3.23 UI wording is **Hardened Packages**

## Related issues or tickets

ENGDOCS-3218

## Reviews

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- [ ] Editorial review

Signed-off-by: Craig Osterhout <craig.osterhout@docker.com>

Author: craig-osterhout

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

@@ -77,14 +77,15 @@ To customize a Docker Hardened Image using the web interface, follow these steps
 1. Select the image version you want to customize.
 1. Optional. Add packages.
 
-   1. In the **Packages** drop-down, select the packages you want to add to the
+   1. In the packages drop-down, select the packages you want to add to the
       image.
 
       The packages available in the drop-down are OS system packages for the
-      selected image variant. For Alpine-based images, these are hardened
-      packages that have been built from source by Docker with cryptographic
-      signatures and full supply chain security. For Debian-based images,
-      these are standard Debian system packages.
+      selected image variant. For version 3.23 Alpine-based images, these are
+      hardened packages that have been built from source by Docker with
+      cryptographic signatures and full supply chain security. For version 3.22
+      Alpine-based images and Debian-based images, these are standard system
+      packages.
 
    1. In the **OCI artifacts** drop-down, first, select the repository that
       contains the OCI artifact image. Then, select the tag you want to use from