Add deb822 apt sources to install section in Debian manual (#23249)

New apt sources format
[RFC822](https://manpages.debian.org/trixie/apt/sources.list.5.en.html)

$ cat /etc/apt/sources.list.d/docker.sources 
Types: deb
URIs: https://download.docker.com/linux/debian/
Suites: trixie
Components: stable
Signed-By: /etc/apt/keyrings/docker.gpg

---------

Co-authored-by: David Karlsson <[email protected]>

Author: LLdaniel

content/manuals/engine/install/debian.md

@@ -116,10 +116,14 @@ Docker from the repository.
    sudo chmod a+r /etc/apt/keyrings/docker.asc
 
    # Add the repository to Apt sources:
-   echo \
-     "deb [arch=$(dpkg --print-architecture) signed-by=/etc/apt/keyrings/docker.asc] {{% param "download-url-base" %}} \
-     $(. /etc/os-release && echo "$VERSION_CODENAME") stable" | \
-     sudo tee /etc/apt/sources.list.d/docker.list > /dev/null
+   sudo tee /etc/apt/sources.list.d/docker.sources <<EOF
+   Types: deb
+   URIs: {{% param "download-url-base" %}}
+   Suites: $(. /etc/os-release && echo "$VERSION_CODENAME")
+   Components: stable
+   Signed-By: /etc/apt/keyrings/docker.asc
+   EOF
+
    sudo apt-get update
    ```