fix: correct typo in architecture name (amr64 -> arm64) (backport release-3.2.x) (#15716)

Co-authored-by: Harshit M <[email protected]>

Author: loki-gh-app[bot]

docs/sources/send-data/docker-driver/_index.md

@@ -31,7 +31,7 @@ docker plugin install grafana/loki-docker-driver:2.9.2 --alias loki --grant-all-
 ```
 
 {{< admonition type="note" >}}
-Add `-arm64` to the image tag for AMR64 hosts.
+Add `-arm64` to the image tag for ARM64 hosts.
 {{< /admonition >}}
 
 To check installed plugins, use the `docker plugin ls` command.