Updating EC2 Spot SLR guidance (#748)

* Updating EC2 Spot SLR guidance

* pr comments

TROUBLESHOOTING.md

@@ -2,6 +2,17 @@
 
 ## Known Problems + Solutions
 
+
+### Missing Service Linked Role
+Unless your AWS account has already onboarded to EC2 Spot, you will need to create the service linked role to avoid `ServiceLinkedRoleCreationNotPermitted`.
+```
+AuthFailure.ServiceLinkedRoleCreationNotPermitted: The provided credentials do not have permission to create the service-linked role for EC2 Spot Instances
+```
+This can be resolved by creating the [Service Linked Role](https://docs.aws.amazon.com/batch/latest/userguide/spot_fleet_IAM_role.html).
+```
+aws iam create-service-linked-role --aws-service-name spot.amazonaws.com
+```
+
 ### Unable to delete nodes after uninstalling Karpenter
 Karpenter adds a [finalizer](https://github.com/awslabs/karpenter/pull/466) to nodes that it provisions to support graceful node termination. If Karpenter is uninstalled, these finalizers will cause the API Server to block deletion until the finalizers are removed.
 

website/content/en/docs/getting-started/_index.md

@@ -137,6 +137,15 @@ eksctl create iamserviceaccount \
   --approve
 ```
 
+### Create the EC2 Spot Service Linked Role
+
+This step is only necessary if this is the first time you're using EC2 Spot in this account. More details are available [here](https://docs.aws.amazon.com/batch/latest/userguide/spot_fleet_IAM_role.html).
+```bash
+aws iam create-service-linked-role --aws-service-name spot.amazonaws.com
+# If the role has already been successfully created, you will see:
+# An error occurred (InvalidInput) when calling the CreateServiceLinkedRole operation: Service role name AWSServiceRoleForEC2Spot has been taken in this account, please try a different suffix.
+```
+
 ### Install Karpenter Helm Chart
 
 Use helm to deploy Karpenter to the cluster.