Replace the default service account in docs

Signed-off-by: Stefan Prodan <stefan.prodan@gmail.com>

docs/guides/installation.md

@@ -242,9 +242,7 @@ mkdir -p ./clusters/my-cluster/flux-system
 Generate the Flux manifests with:
 
 ```sh
-# on ARM64/AARCH64 clusters use --arch=arm64
 flux install --version=latest \
-  --arch=amd64 \
   --export > ./clusters/my-cluster/flux-system/gotk-components.yaml
 ```
 
@@ -388,7 +386,6 @@ Kubernetes manifests that can be used to install or upgrade Flux:
 ```hcl
 data "flux_install" "main" {
   target_path    = "clusters/my-cluster"
-  arch           = "amd64"
   network_policy = false
   version        = "latest"
 }

docs/guides/mozilla-sops.md

@@ -107,8 +107,9 @@ secrets by iterating over all the private keys until it finds one that works.
 ### Using various cloud providers
 
 When using AWS/GCP KMS, you don't have to include the gpg `secretRef` under
-`spec.provider` (you can skip the `--decryption-secret` flag when running `flux create kustomization`), instead you'll have to bind an IAM Role with access to the KMS
-keys to the `default` service account of the `flux-system` namespace for
+`spec.provider` (you can skip the `--decryption-secret` flag when running `flux create kustomization`),
+instead you'll have to bind an IAM Role with access to the KMS
+keys to the `kustomize-controller` service account of the `flux-system` namespace for
 kustomize-controller to be able to fetch keys from KMS.
 
 #### AWS 
@@ -145,13 +146,12 @@ or with [add-pod-identity](https://github.com/Azure/aad-pod-identity).
 Please ensure that the GKE cluster has Workload Identity enabled.
 
 1. Create a service account with the role `Cloud KMS CryptoKey Encrypter/Decrypter`.
-2. Create an IAM policy binding between the GCP service account to the `default` service account of the `flux-system`.
-3. Annotate the `default` service account in the `flux-system` with the GCP service account.
+2. Create an IAM policy binding between the GCP service account to the `kustomize-controller` service account of the `flux-system`.
+3. Annotate the `kustomize-controller` service account in the `flux-system` with the GCP service account.
 
 ```sh
-kubectl annotate serviceaccount \
+kubectl annotate serviceaccount kustomize-controller \
   --namespace flux-system \
-  default \
   iam.gke.io/gcp-service-account=<name-of-serviceaccount>@project-id.iam.gserviceaccount.com
 ```