docs(isString): Add docs for isString for zh_hans

docs/.vitepress/ko.mts

@@ -190,7 +190,7 @@ function sidebar(): DefaultTheme.Sidebar {
             { text: 'isLength', link: '/ko/reference/predicate/isLength' },
             { text: 'isPlainObject', link: '/ko/reference/predicate/isPlainObject' },
             { text: 'isPrimitive', link: '/ko/reference/predicate/isPrimitive' },
-            { text: 'isString', link: 'ko/reference/predicate/isString' },
+            { text: 'isString', link: '/ko/reference/predicate/isString' },
             { text: 'isMatch (호환성)', link: '/ko/reference/compat/predicate/isMatch' },
             { text: 'matches (호환성)', link: '/ko/reference/compat/predicate/matches' },
             { text: 'matchesProperty (호환성)', link: '/ko/reference/compat/predicate/matchesProperty' },

docs/.vitepress/zh_hans.mts

@@ -174,6 +174,7 @@ function sidebar(): DefaultTheme.Sidebar {
             { text: 'isLength', link: '/zh_hans/reference/predicate/isLength' },
             { text: 'isPlainObject', link: '/zh_hans/reference/predicate/isPlainObject' },
             { text: 'isPrimitive', link: '/zh_hans/reference/predicate/isPrimitive' },
+            { text: 'isString', link: '/zh_hans/reference/predicate/isString' },
             { text: 'isSymbol', link: '/zh_hans/reference/predicate/isSymbol' },
             { text: 'isMatch (兼容性)', link: '/zh_hans/reference/compat/predicate/isMatch' },
             { text: 'matches (兼容性)', link: '/zh_hans/reference/compat/predicate/matches' },

docs/zh_hans/reference/predicate/isString.md

@@ -0,0 +1,31 @@
+# isString
+
+检查给定的值是否是一个字符串。
+
+此函数还可以作为 TypeScript 中的类型谓词，将参数的类型缩小为 `string`。
+
+## 签名
+
+```typescript
+function isString(value: unknown): value is string;
+```
+
+### 参数
+
+- `value`(`unknown`): 要测试是否为字符串的值。
+
+### 返回值
+
+- (`x is string`): 如果值是字符串，则返回 `true`，否则返回 `false`。
+
+## 示例
+
+```typescript
+const value1 = 'abc';
+const value2 = 123;
+const value3 = true;
+
+console.log(isString(value1)); // true
+console.log(isString(value2)); // false
+console.log(isString(value3)); // false
+```