curl --request PUT \
  --url https://api.supernotes.app/v1/templates/{template_id} \
  --header 'Api-Key: <api-key>' \
  --header 'Content-Type: application/json' \
  --data '{
  "name": "<string>",
  "markup": "<string>"
}'

{
  "id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "name": "<string>",
  "markup": "<string>",
  "created_when": "2023-11-07T05:31:56Z",
  "modified_when": "2023-11-07T05:31:56Z"
}