Incorrect documentation for func-style

Tell us about your environment

• ESLint Version:
• Node Version:
• npm Version:

What parser (default, Babel-ESLint, etc.) are you using?

Please show your full configuration:

Configuration

What did you do? Please include the actual source code causing the issue, as well as the command that you used to run ESLint.

What did you expect to happen?

The correct code example for the configuration /*eslint func-style: ["error", "expression"]*/ shouldn’t have an arrow function, as they’re disallowed by default.

https://eslint.org/docs/rules/func-style#expression

What actually happened? Please include the actual, raw output from ESLint.

/*eslint func-style: ["error", "expression"]*/

var foo = function() {
    // ...
};

var foo = () => {};

Are you willing to submit a pull request to fix this bug?

Maybe.

[platinumazure]

Should we disallow the allowArrowFunctions: true option when the user is using “expression” mode? It’s not a great experience to have an option that doesn’t do anything in some cases.

[anikethsaha]

Should we disallow the allowArrowFunctions: true option when the user is using “expression” mode? It’s not a great experience to have an option that doesn’t do anything in some cases.

I think allowArrowFunctions does nothing as arrow function cant be possible for declaration.