fix(storage/vfs): Fix typo in code snippet in docs

docs/en/api-reference/storage/vfs.rst

@@ -29,7 +29,7 @@ To register an FS driver, an application needs to define an instance of the :cpp
 
     // Both esp_vfs_fs_ops_t and its subcomponents have to have static storage
     static const esp_vfs_dir_ops_t myfs_dir = {
-        .fstat = &myfs_fstat,
+        .stat = &myfs_stat,
     };
 
     static const esp_vfs_fs_ops_t myfs = {
@@ -55,7 +55,7 @@ The recommended approach for registering filesystem is to use statically allocat
     // Possibly local scope
     {
         esp_vfs_dir_ops_t myfs_dir = {
-            .fstat = &myfs_fstat,
+            .stat = &myfs_stat,
         };
 
         bool some_condition = false;

docs/zh_CN/api-reference/storage/vfs.rst

@@ -29,7 +29,7 @@ VFS 组件支持 C 库函数（如 fopen 和 fprintf 等）与文件系统 (FS)
 
     // esp_vfs_fs_ops_t 及其子组件的声明必须是静态的
     static const esp_vfs_dir_ops_t myfs_dir = {
-        .fstat = &myfs_fstat,
+        .stat = &myfs_stat,
     };
 
     static const esp_vfs_fs_ops_t myfs = {
@@ -55,7 +55,7 @@ VFS 组件支持 C 库函数（如 fopen 和 fprintf 等）与文件系统 (FS)
     // 可能是局部作用域
     {
         esp_vfs_dir_ops_t myfs_dir = {
-            .fstat = &myfs_fstat,
+            .stat = &myfs_stat,
         };
 
         bool some_condition = false;