chore(external docs): fix reference to supported aarch64 architecture (#17553)

Author: neuronull

website/content/en/docs/setup/installation/package-managers/rpm.md

@@ -15,7 +15,7 @@ sudo rpm -i https://packages.timber.io/vector/{{< version >}}/vector-{{< version
 Make sure to replace `{arch}` with one of the following:
 
 * `x86_64`
-* `arm64`
+* `aarch64`
 * `armv7`
 
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