Update docs/modules/ROOT/pages/explanations/supported-cpus.adoc

Co-authored-by: Tobias Brunner <tobias.brunner@vshn.ch>

Author: cimnine

docs/modules/ROOT/pages/explanations/supported-cpus.adoc

@@ -3,7 +3,7 @@
 K8up is only built for Linux.
 The only supported CPU architecture is currently the _x64_ (otherwise known as _AMD64_ and _x86-64_).
 
-In v2.x we introduced builds of the K8up binary for the _AArch64_ CPU architecture (otherwise known as _amd64_).
+In v2.x we introduced builds of the K8up binary for the _AArch64_ CPU architecture (otherwise known as _arm64_).
 These builds are currently provided on a best-effort basis without further testing or support.
 
 We will eventually provide Docker builds for _AArch64_ CPUs as well.