Update description of preinstalled devroot

Signed-off-by: Martyn Welch <martyn.welch@collabora.com>

content/guides/tooling.md

@@ -323,8 +323,9 @@ same binaries as the target image, but with additional tools pre-installed,
 such as native compilers, debuggers and other development tools.
 
 {{% notice info %}}
-By default, the Apertis SDK ships with a pre-installed `armhf` devroot, but
-different devroots can be downloaded and used.
+By default, Apertis SDKs prior to v2024 ship with an `armhf` devroot
+pre-installed, with v2024 and later SDKs shipping with an `arm64` devroot.
+Different devroots can be downloaded and used if required.
 {{% /notice %}}
 
 To enable this workflow, Apertis SDK provides `devroot-enter`, a wrapper for