engine: add explicit Architecture to ubuntu/debian install instructions

Signed-off-by: David Karlsson <35727626+dvdksn@users.noreply.github.com>

Author: dvdksn

content/manuals/engine/install/debian.md

@@ -121,6 +121,7 @@ Docker from the repository.
    URIs: {{% param "download-url-base" %}}
    Suites: $(. /etc/os-release && echo "$VERSION_CODENAME")
    Components: stable
+   Architectures: $(dpkg --print-architecture)
    Signed-By: /etc/apt/keyrings/docker.asc
    EOF
 

content/manuals/engine/install/ubuntu.md

@@ -137,6 +137,7 @@ Docker from the repository.
    URIs: {{% param "download-url-base" %}}
    Suites: $(. /etc/os-release && echo "${UBUNTU_CODENAME:-$VERSION_CODENAME}")
    Components: stable
+   Architectures: $(dpkg --print-architecture)
    Signed-By: /etc/apt/keyrings/docker.asc
    EOF