some stylistic changes, improve a note

CHANGELOG.md

@@ -1,6 +1,6 @@
 ## Changelog
 ##### Unreleased
-- Added a workaround of a Nashorn bug with `Function.prototype.{ call, bind }`, [#1128](https://github.com/zloirock/core-js/issues/1128)
+- Added a workaround of a Nashorn bug with `Function.prototype.{ call, apply, bind }` on string methods, [#1128](https://github.com/zloirock/core-js/issues/1128)
 - `Array.prototype.{ group, groupToMap }` marked as [supported from V8 ~ Chromium 108](https://chromestatus.com/feature/5714791975878656)
 - Added Electron 22 compat data mapping
 

packages/core-js/internals/function-uncurry-this.js

@@ -1,19 +1,16 @@
 var NATIVE_BIND = require('../internals/function-bind-native');
 
-var FunctionPrototype = Function.prototype;
+var $Function = Function;
+var FunctionPrototype = $Function.prototype;
 var bind = FunctionPrototype.bind;
 var call = FunctionPrototype.call;
 var uncurryThis = NATIVE_BIND && bind.bind(call, call);
 
 module.exports = function (fn) {
-  var isNativeFunction = fn instanceof Function;
   // Nashorn bug:
   //   https://github.com/zloirock/core-js/issues/1128
   //   https://github.com/zloirock/core-js/issues/1130
-  if (!isNativeFunction) return;
-  return NATIVE_BIND
-    ? uncurryThis(fn)
-    : function () {
-      return call.apply(fn, arguments);
-    };
+  return fn instanceof $Function ? NATIVE_BIND ? uncurryThis(fn) : function () {
+    return call.apply(fn, arguments);
+  } : undefined;
 };