Before You File a Bug Report Please Confirm You Have Done The Following...

• I have tried restarting my IDE and the issue persists.
• I have updated to the latest version of the packages.
• I have searched for related issues and found none that matched my issue.
• I have read the FAQ and my problem is not listed.

Playground Link

https://typescript-eslint.io/play/#ts=5.5.2&fileType=.ts&code=GYVwdgxgLglg9mABABwIYCcDOBTAUphAHgBVFsAPKbMAE00UynRjAHMA%2BACheRCgC4GTFqwCUg0gG8AUIkTpsUEOiS4AygHkAcgDo0WbNzC8ooxKnrEA3NIC%2BQA&eslintrc=N4KABGBEBOCuA2BTAzpAXGUEKQAIBcBPABxQGNoBLY-AWhXkoDt8B6Jge1tiacTJTIAhtEK0ipWsRFCAtonyJoqDJCXQO0SODABfELqA&tsconfig=N4KABGBEDGD2C2AHAlgGwKYCcDyiAuysAdgM6QBcYoEEkJemy0eFYDAruuGAL4g9A&tokens=false

Repro Code

// T is used twice - maybe it should say "once in the signature"?
function parseJson<T extends string>(input: string): T {
  return JSON.parse(input) as T;
}

// T is used zero times
function parseJson<T extends string>(input: string): any {
  return JSON.parse(input) as any;
}

ESLint Config

{
  "rules": {
    "@typescript-eslint/no-unnecessary-type-parameters": "error"
  }
}

tsconfig

{
  "compilerOptions": {
    "strict": true
  }
}

Expected Result

I expect the error message should reflect correctly the number of times the type parameter is used.

Actual Result

"Type parameter T is used only once." in both cases

Additional Info

Let's also include a doc change to the docs page, if counting parameters is only supposed to be counting the usages in the signature?