doc: Explain more about the response AMP is returning

### What would you like to be added?

Storing metrics with AMP

Let's verify the successful ingestion of the metrics:

awscurl -X POST --region $AWS_REGION --service aps "${AMP_ENDPOINT}api/v1/query?query=up" | jq '.data.result[1]'

`
{
"metric": {

"__name__": "up",

"account_id": "1234567890",

"beta_kubernetes_io_arch": "amd64",

"beta_kubernetes_io_instance_type": "m5.large",

"beta_kubernetes_io_os": "linux",

"cluster": "eks-workshop",

"eks_amazonaws_com_capacityType": "ON_DEMAND",

"eks_amazonaws_com_nodegroup": "managed-ondemand-2022110404042617720000001b",

"eks_amazonaws_com_nodegroup_image": "ami-01dfb5782bffd09d6",

"eks_amazonaws_com_sourceLaunchTemplateId": "lt-0566ef61fb851d6e1",

"eks_amazonaws_com_sourceLaunchTemplateVersion": "1",

"failure_domain_beta_kubernetes_io_region": "us-west-2",

"failure_domain_beta_kubernetes_io_zone": "us-west-2c",

"instance": "ip-10-42-12-99.us-west-2.compute.internal",

"job": "kubernetes-kubelet",

"k8s_io_cloud_provider_aws": "ffc60533e6d069826fca0578b02694a2",

"kubernetes_io_arch": "amd64",

"kubernetes_io_hostname": "ip-10-42-12-99.us-west-2.compute.internal",

"kubernetes_io_os": "linux",

"node_kubernetes_io_instance_type": "m5.large",

"region": "us-west-2",

"topology_ebs_csi_aws_com_zone": "us-west-2c",

"topology_kubernetes_io_region": "us-west-2",

"topology_kubernetes_io_zone": "us-west-2c",

"workshop_default": "yes"

},

"value": [

1667597359,

"1"

]

}`

### Why is this needed?

What does the above response signify? Could we add more information about this?

Start with the awscurl AMP query and its jq '.data.result[1]' selection shown in the issue, then review the displayed metric and value fields. Done means the documentation explains what the returned labels, timestamp, and sample value signify in the successful ingestion check.

Written by the indexing model from the issue text.