docs(space-before-function-paren): remove outdated info (#837)

Author: 9romise

packages/eslint-plugin/rules/space-before-function-paren/README.md

@@ -49,8 +49,6 @@ This rule has a string option or an object option:
 - `always` (default) requires a space followed by the `(` of arguments.
 - `never` disallows any space followed by the `(` of arguments.
 
-The string option does not check async arrow function expressions for backward compatibility.
-
 You can also use a separate option for each type of function.
 Each of the following options can be set to `"always"`, `"never"`, or `"ignore"`. The default is `"always"`.
 

packages/eslint-plugin/rules/space-before-function-paren/space-before-function-paren.ts

@@ -110,9 +110,8 @@ export default createRule<RuleOptions, MessageIds>({
       }
       else if (isNamedFunction(node)) {
         return overrideConfig.named ?? baseConfig
-
-        // `generator-star-spacing` should warn anonymous generators. E.g. `function* () {}`
       }
+      // `generator-star-spacing` should warn anonymous generators. E.g. `function* () {}`
       else if (!node.generator) {
         return overrideConfig.anonymous ?? baseConfig
       }