fix: correct typo in architecture name (amr64 -> arm64) (#15707)

Signed-off-by: Harshit M <[email protected]>

Author: djharshit

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

@@ -31,7 +31,7 @@ docker plugin install grafana/loki-docker-driver:3.3.2-arm64 --alias loki --gran
 ```
 
 {{< 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.