Fix eksctl get cluster command

[netman2k]

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It should be "eksctl get cluster" not clusters.

❯ eksctl get clsuters
Error: unknown resource type "clsuters"

Get resource(s)

Usage: eksctl get [flags]

Commands:
  eksctl get addon                           Get an Addon
  eksctl get cluster                         Get cluster(s)
  eksctl get fargateprofile                  Get Fargate profile(s)
  eksctl get iamidentitymapping              Get IAM identity mapping(s)
  eksctl get iamserviceaccount               Get iamserviceaccount(s)
  eksctl get identityprovider                Describe identity providers for cluster authentication and authorization
  eksctl get labels                          Get labels for managed nodegroup
  eksctl get nodegroup                       Get nodegroup(s)