Docs: prefer-readonly-parameter-types rule docs contains broken examples

### Before You File a Documentation Request Please Confirm You Have Done The Following...

- [X] I have looked for existing [open or closed documentation requests](https://github.com/typescript-eslint/typescript-eslint/issues?q=is%3Aissue+label%3Adocumentation) that match my proposal.
- [X] I have [read the FAQ](https://typescript-eslint.io/linting/troubleshooting) and my problem is not listed.

### Suggested Changes

Syntax error ([playground](https://typescript-eslint.io/play/#ts=5.3.2&fileType=.ts&code=MYewdgzgLgBAHjAvDA3jAZiEAKAhgJwHMAuGafASzEIG0BdASlIDcQKATGGAXwG4AoIA&eslintrc=N4KABGBEBOCuA2BTAzpAXGUEKQAIBcBPABxQGNoBLY-AWhXkoDt8B6Y6RAM0Wls4CGAEwD2TeIVrEB0AQFtE%2BXrSKlUGSL2gjokcGAC%2BIA0A&tsconfig=&tokens=false))
https://github.com/typescript-eslint/typescript-eslint/blob/7246e5604afb20835088104cb47c03b16610f21c/packages/eslint-plugin/docs/rules/prefer-readonly-parameter-types.md?plain=1#L60

Should not be in _Correct_ example as it's actually incorrect ([playground](https://typescript-eslint.io/play/#ts=5.3.2&fileType=.ts&code=GYVwdgxgLglg9mABOeYAUBDATgcwFyJYCmGAJggDYCeiAzlFjGDgNoC6iAPogEonlhqAQSxYMVADxgQAWwBGRLOwB8ASkQBvAL4AoIA&eslintrc=N4KABGBEBOCuA2BTAzpAXGUEKQAIBcBPABxQGNoBLY-AWhXkoDt8B6Y6RAM0Wls4CGAEwD2TeIVrEB0AQFtE%2BXrSKlUGSL2gjokcGAC%2BIA0A&tsconfig=&tokens=false)):
https://github.com/typescript-eslint/typescript-eslint/blob/7246e5604afb20835088104cb47c03b16610f21c/packages/eslint-plugin/docs/rules/prefer-readonly-parameter-types.md?plain=1#L94

`enum` is a reserved word ([playground](https://typescript-eslint.io/play/#ts=5.3.2&fileType=.ts&code=KYOwrgtgBAYg9nKBvKBDANFARlAvgKADMwQBjAFwEs4QpRIAKVAJwHMAuWBASmTyA&eslintrc=N4KABGBEBOCuA2BTAzpAXGUEKQAIBcBPABxQGNoBLY-AWhXkoDt8B6Y6RAM0Wls4CGAEwD2TeIVrEB0AQFtE%2BXrSKlUGSL2gjokcGAC%2BIA0A&tsconfig=&tokens=false)):
https://github.com/typescript-eslint/typescript-eslint/blob/7246e5604afb20835088104cb47c03b16610f21c/packages/eslint-plugin/docs/rules/prefer-readonly-parameter-types.md?plain=1#L108-L109

Syntax error ([playground](https://typescript-eslint.io/play/#ts=5.3.2&fileType=.ts&code=MYewdgzgLgBAHjAvDA3jAZiEAKAhgJwHMAuGfAU1wBNwAbATxmnwEsxCBtAXQEpSA3ECyoBuGAF8gA&eslintrc=N4KABGBEBOCuA2BTAzpAXGUEKQAIBcBPABxQGNoBLY-AWhXkoDt8B6Y6RAM0Wls4CGAEwD2TeIVrEB0AQFtE%2BXrSKlUGSL2gjokcGAC%2BIA0A&tsconfig=&tokens=false)):
https://github.com/typescript-eslint/typescript-eslint/blob/7246e5604afb20835088104cb47c03b16610f21c/packages/eslint-plugin/docs/rules/prefer-readonly-parameter-types.md?plain=1#L122

### Affected URL(s)

https://typescript-eslint.io/rules/prefer-readonly-parameter-types

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Docs: prefer-readonly-parameter-types rule docs contains broken examples #8133

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	enum Foo { a, b }
	function enum(arg: Foo) {}

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Docs: prefer-readonly-parameter-types rule docs contains broken examples #8133

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