Fix code example for prettier.resolveConfig (#16525)

docs/api.md

@@ -49,7 +49,10 @@ If `options.useCache` is `false`, all caching will be bypassed.
 ```js
 const text = await fs.readFile(filePath, "utf8");
 const options = await prettier.resolveConfig(filePath);
-const formatted = await prettier.format(text, options);
+const formatted = await prettier.format(text, {
+  ...options,
+  filepath: filePath,
+});
 ```
 
 If `options.editorconfig` is `true` and an [`.editorconfig` file](https://editorconfig.org/) is in your project, Prettier will parse it and convert its properties to the corresponding Prettier configuration. This configuration will be overridden by `.prettierrc`, etc. Currently, the following EditorConfig properties are supported: